<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:ff9e138a-c7a9-465d-b50f-a474374bfb8e,g:54d6266d-2b4d-4712-a650-f00fbe0175c5-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.fnf.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="fnf-20251231.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_31da408c-51dc-4509-8ccd-d4b77c683fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_de106606-a48d-48e5-bc19-b915ae06eedc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_31da408c-51dc-4509-8ccd-d4b77c683fa5" xlink:to="loc_us-gaap_StatementTable_de106606-a48d-48e5-bc19-b915ae06eedc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_ecd59948-0c8a-4ea0-b8f4-d922f0c8cf1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_de106606-a48d-48e5-bc19-b915ae06eedc" xlink:to="loc_us-gaap_FinancialInstrumentAxis_ecd59948-0c8a-4ea0-b8f4-d922f0c8cf1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ecd59948-0c8a-4ea0-b8f4-d922f0c8cf1c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_ecd59948-0c8a-4ea0-b8f4-d922f0c8cf1c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ecd59948-0c8a-4ea0-b8f4-d922f0c8cf1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1525c092-73a4-4382-ba3a-e9403fb6d2bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_ecd59948-0c8a-4ea0-b8f4-d922f0c8cf1c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1525c092-73a4-4382-ba3a-e9403fb6d2bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_faf686ad-2c3b-4db0-9c93-0fafda800bb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1525c092-73a4-4382-ba3a-e9403fb6d2bb" xlink:to="loc_us-gaap_PreferredStockMember_faf686ad-2c3b-4db0-9c93-0fafda800bb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_667aaa8e-22e2-4b24-aeaa-5b56fe5d3cdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1525c092-73a4-4382-ba3a-e9403fb6d2bb" xlink:to="loc_us-gaap_EquitySecuritiesMember_667aaa8e-22e2-4b24-aeaa-5b56fe5d3cdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_31da408c-51dc-4509-8ccd-d4b77c683fa5" xlink:to="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_0e1a1485-d6bd-462d-a8e0-702a13ec8603" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_0e1a1485-d6bd-462d-a8e0-702a13ec8603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_d008f15b-831f-47c7-a1f1-7d44d3c41479" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_d008f15b-831f-47c7-a1f1-7d44d3c41479" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_d9de308b-a63a-42ea-a569-302b9de3c121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_DerivativeAssets_d9de308b-a63a-42ea-a569-302b9de3c121" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_bd6f0699-e3cf-4cf4-ab0b-77fb4fe1560c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_bd6f0699-e3cf-4cf4-ab0b-77fb4fe1560c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_f8fc7a76-555a-4ba1-86f2-15da3ee91c3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_EquityMethodInvestments_f8fc7a76-555a-4ba1-86f2-15da3ee91c3b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestments_c38fd081-162f-4d92-b934-7f6331d1c64a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_OtherLongTermInvestments_c38fd081-162f-4d92-b934-7f6331d1c64a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherShortTermInvestments_6ad886f8-ecff-418e-91cd-60f6c7319a13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_OtherShortTermInvestments_6ad886f8-ecff-418e-91cd-60f6c7319a13" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_ae01a903-40a5-46c1-bad1-e5c6182a5f00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_cc022557-6cdf-4cb4-b334-277c2b44c42b" xlink:to="loc_us-gaap_Investments_ae01a903-40a5-46c1-bad1-e5c6182a5f00" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_602e0853-d2e0-4137-88d1-4c44010ad3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_602e0853-d2e0-4137-88d1-4c44010ad3c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_801cbf94-543e-406e-b42e-a966b237a7bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndNotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_801cbf94-543e-406e-b42e-a966b237a7bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_222dfc00-0f40-4de2-8260-7ac953404a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_ReinsuranceRecoverables_222dfc00-0f40-4de2-8260-7ac953404a4b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_85f09be1-6069-453b-a00f-6e3ed99ec054" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_Goodwill_85f09be1-6069-453b-a00f-6e3ed99ec054" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_396f2f4e-81c9-46fd-8b91-b6a8f0675c71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_396f2f4e-81c9-46fd-8b91-b6a8f0675c71" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_4d7d2c0f-57bb-4c99-aa99-449e4ec4773a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_4d7d2c0f-57bb-4c99-aa99-449e4ec4773a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_e6dde79c-3425-4ce8-8c26-32886402433b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_e6dde79c-3425-4ce8-8c26-32886402433b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IntangibleAssetsNetExcludingGoodwillAndTitlePlants_dabb5e68-bf34-4547-b9b7-9ea633b3aba9" xlink:href="fnf-20251231.xsd#fnf_IntangibleAssetsNetExcludingGoodwillAndTitlePlants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_fnf_IntangibleAssetsNetExcludingGoodwillAndTitlePlants_dabb5e68-bf34-4547-b9b7-9ea633b3aba9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IntangibleAssetsTitlePlants_271e7370-3c4e-47a1-8849-9f2d18152429" xlink:href="fnf-20251231.xsd#fnf_IntangibleAssetsTitlePlants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_fnf_IntangibleAssetsTitlePlants_271e7370-3c4e-47a1-8849-9f2d18152429" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_474256b0-19a1-40b4-a21c-4eb3d5209ee2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_474256b0-19a1-40b4-a21c-4eb3d5209ee2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_c33994b1-db1c-4e1f-8b87-59e006772281" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_082c4caf-247f-49a6-b7a7-d320326eaba8" xlink:to="loc_us-gaap_Assets_c33994b1-db1c-4e1f-8b87-59e006772281" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1cad5921-e69f-46dd-8186-c310778ad02f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_31da408c-51dc-4509-8ccd-d4b77c683fa5" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1cad5921-e69f-46dd-8186-c310778ad02f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1cad5921-e69f-46dd-8186-c310778ad02f" xlink:to="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_0a72245c-235a-487c-acf2-dc7867bffc41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_PolicyholderFunds_0a72245c-235a-487c-acf2-dc7867bffc41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_44a21143-5c81-4693-b73c-d809124fd355" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_44a21143-5c81-4693-b73c-d809124fd355" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_1ab9685a-a9fa-43c4-b2b8-2d2a6397b31b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_1ab9685a-a9fa-43c4-b2b8-2d2a6397b31b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_349678cf-2ddf-4a78-83a9-8a72b51f8fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_349678cf-2ddf-4a78-83a9-8a72b51f8fc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_17d42f46-ef69-4b04-b3b7-64a251f9f63d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_LongTermDebt_17d42f46-ef69-4b04-b3b7-64a251f9f63d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet_bfac6750-29c8-4acf-8491-1f5166243c96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet_bfac6750-29c8-4acf-8491-1f5166243c96" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_2cc3bfea-e1cd-4ae6-a4d5-37bccf4075d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_2cc3bfea-e1cd-4ae6-a4d5-37bccf4075d3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ContractWithCustomerLiabilityCustomerDeposits_39959054-41aa-4e6b-aa5f-fca5df39ef99" xlink:href="fnf-20251231.xsd#fnf_ContractWithCustomerLiabilityCustomerDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_fnf_ContractWithCustomerLiabilityCustomerDeposits_39959054-41aa-4e6b-aa5f-fca5df39ef99" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_316106b6-9f6a-4a66-9f06-0a0c9b42253e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_OperatingLeaseLiability_316106b6-9f6a-4a66-9f06-0a0c9b42253e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_8f401229-3f7e-4a1a-92b2-97c03a24a52f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_8f401229-3f7e-4a1a-92b2-97c03a24a52f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_3cdefcca-b235-484d-b4bb-9f116db4e9ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_3cdefcca-b235-484d-b4bb-9f116db4e9ea" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_28490a95-5cb2-42b7-8dd5-8167da339355" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_a36df28a-bc0f-4ec0-8f24-805545402145" xlink:to="loc_us-gaap_Liabilities_28490a95-5cb2-42b7-8dd5-8167da339355" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1cad5921-e69f-46dd-8186-c310778ad02f" xlink:to="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_e18e73de-45d4-47fd-9ff3-6835d64f5b2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_CommonStockValue_e18e73de-45d4-47fd-9ff3-6835d64f5b2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_c3a24f5e-b625-4b11-a68b-c2bdfc130bca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_PreferredStockValue_c3a24f5e-b625-4b11-a68b-c2bdfc130bca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_a89b1c48-be5f-476b-8e6e-c52a5341956f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_a89b1c48-be5f-476b-8e6e-c52a5341956f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_d183d4c4-d0b1-4020-839b-caeb85e3a009" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_d183d4c4-d0b1-4020-839b-caeb85e3a009" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_9ee54d15-7958-4cfd-a202-24b99fc7741e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_9ee54d15-7958-4cfd-a202-24b99fc7741e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_5fad4b5a-1138-45d8-ae9e-f3fe9fbba504" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_TreasuryStockValue_5fad4b5a-1138-45d8-ae9e-f3fe9fbba504" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c570015f-d635-4512-b102-ee40d8c6e560" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_StockholdersEquity_c570015f-d635-4512-b102-ee40d8c6e560" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_26f47eb2-2450-4604-be19-7fe82e6bedec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_MinorityInterest_26f47eb2-2450-4604-be19-7fe82e6bedec" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b363074c-3ed1-46de-b942-5732be10fe8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_00ea5c82-817c-4575-8aea-f7846e19b185" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_b363074c-3ed1-46de-b942-5732be10fe8d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_33effd14-a6ed-4b74-a6b9-0b93fb023fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1cad5921-e69f-46dd-8186-c310778ad02f" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_33effd14-a6ed-4b74-a6b9-0b93fb023fa4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="fnf-20251231.xsd#CONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4f167081-90f0-482f-8320-f6c71dcc6fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d520fe6a-c8b8-4301-b163-49d34948645b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4f167081-90f0-482f-8320-f6c71dcc6fdf" xlink:to="loc_us-gaap_StatementTable_d520fe6a-c8b8-4301-b163-49d34948645b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_9a1f4bf7-f883-4dcf-bcf7-d5ab62db3c5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d520fe6a-c8b8-4301-b163-49d34948645b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_9a1f4bf7-f883-4dcf-bcf7-d5ab62db3c5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9a1f4bf7-f883-4dcf-bcf7-d5ab62db3c5b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9a1f4bf7-f883-4dcf-bcf7-d5ab62db3c5b" xlink:to="loc_us-gaap_EquityComponentDomain_9a1f4bf7-f883-4dcf-bcf7-d5ab62db3c5b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9a1f4bf7-f883-4dcf-bcf7-d5ab62db3c5b" xlink:to="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_0b9f95a2-159e-496d-9e26-96ab864627d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:to="loc_us-gaap_CommonStockMember_0b9f95a2-159e-496d-9e26-96ab864627d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_1a266016-2ffd-4af5-a641-8a9361c87925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_1a266016-2ffd-4af5-a641-8a9361c87925" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_36997241-f02c-4cde-b8c4-cb992c7bc115" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:to="loc_us-gaap_RetainedEarningsMember_36997241-f02c-4cde-b8c4-cb992c7bc115" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fa5349f2-4fa1-4f33-8d7a-2043e3103e7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fa5349f2-4fa1-4f33-8d7a-2043e3103e7d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_b7219931-19a2-4ab6-88de-1c0d4314ea34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:to="loc_us-gaap_TreasuryStockCommonMember_b7219931-19a2-4ab6-88de-1c0d4314ea34" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_b2e75302-4c5a-434a-8c01-bbfa16688ce1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6b64d839-5d71-4c90-b851-6c8f7efd3fc2" xlink:to="loc_us-gaap_NoncontrollingInterestMember_b2e75302-4c5a-434a-8c01-bbfa16688ce1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_934efe01-e937-4c15-9b2a-21137d3efdef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d520fe6a-c8b8-4301-b163-49d34948645b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_934efe01-e937-4c15-9b2a-21137d3efdef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_934efe01-e937-4c15-9b2a-21137d3efdef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_934efe01-e937-4c15-9b2a-21137d3efdef" xlink:to="loc_us-gaap_SegmentDomain_934efe01-e937-4c15-9b2a-21137d3efdef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_30c8a9e2-fbad-43d8-aa17-0133511991dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_934efe01-e937-4c15-9b2a-21137d3efdef" xlink:to="loc_us-gaap_SegmentDomain_30c8a9e2-fbad-43d8-aa17-0133511991dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGMember_0cfc06d7-feb3-4809-a715-a28a068bb0fa" xlink:href="fnf-20251231.xsd#fnf_FGMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_30c8a9e2-fbad-43d8-aa17-0133511991dc" xlink:to="loc_fnf_FGMember_0cfc06d7-feb3-4809-a715-a28a068bb0fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4f167081-90f0-482f-8320-f6c71dcc6fdf" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_0960e46a-583e-4e28-80c2-3b1f3ff1c499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_SharesIssued_0960e46a-583e-4e28-80c2-3b1f3ff1c499" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8491fd17-10e9-4aec-af2c-5bd5693ca840" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8491fd17-10e9-4aec-af2c-5bd5693ca840" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_3d3fa352-0045-453e-b18a-e2569add2462" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_TreasuryStockCommonShares_3d3fa352-0045-453e-b18a-e2569add2462" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_ac97c229-4bc3-4b5d-b68e-ef45498ed4aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_ac97c229-4bc3-4b5d-b68e-ef45498ed4aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_fee934d8-bba3-4588-9a5f-7a2d7707500a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_fee934d8-bba3-4588-9a5f-7a2d7707500a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019c5597-3669-7214-b1e9-b2356f476115" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019c5597-3669-7214-b1e9-b2356f476115" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_bb36f5c5-0790-4ef3-908d-cd5190937080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_bb36f5c5-0790-4ef3-908d-cd5190937080" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019c5593-087f-7626-b7e2-2bb589d6c7f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_019c5593-087f-7626-b7e2-2bb589d6c7f9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_9bd99b4c-2cc7-46e5-8a5b-a10e3208ad59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_9bd99b4c-2cc7-46e5-8a5b-a10e3208ad59" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_019b7236-eaa9-73a7-af13-39b2b949a696" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_019b7236-eaa9-73a7-af13-39b2b949a696" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_1c42ce66-29a9-4ed0-bf02-467abd9d7838" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_1c42ce66-29a9-4ed0-bf02-467abd9d7838" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_00b03d6c-8043-417a-98a5-6905b8902f94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_00b03d6c-8043-417a-98a5-6905b8902f94" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_a1caa2d6-4c09-4858-9e1d-a0f84e34fde2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_a1caa2d6-4c09-4858-9e1d-a0f84e34fde2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciEquityMethodInvestmentAfterTax_6adcf4bc-6c88-4f13-ab19-c24c0bf07f23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciEquityMethodInvestmentAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OciEquityMethodInvestmentAfterTax_6adcf4bc-6c88-4f13-ab19-c24c0bf07f23" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_812c5ab5-486d-4186-8ed5-8b5abadc5898" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_812c5ab5-486d-4186-8ed5-8b5abadc5898" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_76d50fb2-ff31-4140-ab46-e22450a1698e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_76d50fb2-ff31-4140-ab46-e22450a1698e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_c1b9445f-8ca5-4f98-9e1a-061fd2c9d1dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_c1b9445f-8ca5-4f98-9e1a-061fd2c9d1dd" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterestSpinoff_3bf37d85-139f-4293-a8ed-9943ca6f1410" xlink:href="fnf-20251231.xsd#fnf_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterestSpinoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_fnf_OtherComprehensiveIncomeLossTaxPortionAttributableToNoncontrollingInterestSpinoff_3bf37d85-139f-4293-a8ed-9943ca6f1410" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_95e8c712-2da9-4b1c-808e-88747fee8d88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_95e8c712-2da9-4b1c-808e-88747fee8d88" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DilutionFromShareIssuanceByConsolidatedSubsidary_700c021d-3d89-4d11-9073-e0c911a37f31" xlink:href="fnf-20251231.xsd#fnf_DilutionFromShareIssuanceByConsolidatedSubsidary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_fnf_DilutionFromShareIssuanceByConsolidatedSubsidary_700c021d-3d89-4d11-9073-e0c911a37f31" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_17deb077-5b0b-4de7-9743-e5d9ca8b2367" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_DividendsCommonStockCash_17deb077-5b0b-4de7-9743-e5d9ca8b2367" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_382f4dd1-e583-4d53-a366-85b3e6304a27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_382f4dd1-e583-4d53-a366-85b3e6304a27" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_49068d21-d5f8-4976-bce1-c0627318ec92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_49068d21-d5f8-4976-bce1-c0627318ec92" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NoncontrollingInterestReturnOfCapital_019c288f-8658-77e5-9b3a-83fc3d8b97e5" xlink:href="fnf-20251231.xsd#fnf_NoncontrollingInterestReturnOfCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_fnf_NoncontrollingInterestReturnOfCapital_019c288f-8658-77e5-9b3a-83fc3d8b97e5" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax_8a0220af-22ba-47a5-b0c8-ae1467dc4635" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OciLiabilityForFuturePolicyBenefitGainLossAfterReclassificationAdjustmentAndTax_8a0220af-22ba-47a5-b0c8-ae1467dc4635" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciMarketRiskBenefitInstrumentSpecificCreditRiskGainLossAfterAdjustmentsAndTax_f2d04113-ce8b-4402-a7d9-5b3907f8d5cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciMarketRiskBenefitInstrumentSpecificCreditRiskGainLossAfterAdjustmentsAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_OciMarketRiskBenefitInstrumentSpecificCreditRiskGainLossAfterAdjustmentsAndTax_f2d04113-ce8b-4402-a7d9-5b3907f8d5cf" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_5f1823bd-5962-4536-8fc9-525b292e83c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_5f1823bd-5962-4536-8fc9-525b292e83c1" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NoncontrollingInterestDistributionsToNoncontrollingInterestHolders_019c2950-b84b-71d0-b8c3-47ae1450b432" xlink:href="fnf-20251231.xsd#fnf_NoncontrollingInterestDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_fnf_NoncontrollingInterestDistributionsToNoncontrollingInterestHolders_019c2950-b84b-71d0-b8c3-47ae1450b432" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_a31ab1e1-e889-4eb9-9952-dd3a7f649802" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_bb74a784-b10b-4f70-8f47-5dee6526204f" xlink:to="loc_us-gaap_ProfitLoss_a31ab1e1-e889-4eb9-9952-dd3a7f649802" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_1cf8aba4-5e50-4983-94a2-6bfdd9114a33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_c0b27976-7a05-4e5a-a187-88203f871ebd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_4ddb0de2-8499-4edb-8ba3-bd4a386a822c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesRecentDevelopmentsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#BusinessandSummaryofSignificantAccountingPoliciesRecentDevelopmentsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesRecentDevelopmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c290d-dd51-7d53-a40d-33947cd9c524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c290d-dd51-7d53-a40d-33947cd9c524" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c290d-dd51-7d53-a40d-33947cd9c524_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c290d-dd51-7d53-a40d-33947cd9c524" xlink:to="loc_us-gaap_ClassOfStockDomain_019c290d-dd51-7d53-a40d-33947cd9c524_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c290d-dd51-70b1-91ce-81f98302ab71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c290d-dd51-7d53-a40d-33947cd9c524" xlink:to="loc_us-gaap_ClassOfStockDomain_019c290d-dd51-70b1-91ce-81f98302ab71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c290d-dd51-7751-8689-70c11dc00a63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c290d-dd51-70b1-91ce-81f98302ab71" xlink:to="loc_us-gaap_CommonStockMember_019c290d-dd51-7751-8689-70c11dc00a63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019c290e-48ab-7dd0-a36d-08aea98c0665" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019c290e-48ab-7dd0-a36d-08aea98c0665" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-7dd0-a36d-08aea98c0665_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c290e-48ab-7dd0-a36d-08aea98c0665" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-7dd0-a36d-08aea98c0665_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-70c1-a485-831ca399260c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c290e-48ab-7dd0-a36d-08aea98c0665" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-70c1-a485-831ca399260c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A2025FGDistributionMember_019c5b04-106b-77e7-b297-1d3f76ea0b91" xlink:href="fnf-20251231.xsd#fnf_A2025FGDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-70c1-a485-831ca399260c" xlink:to="loc_fnf_A2025FGDistributionMember_019c5b04-106b-77e7-b297-1d3f76ea0b91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PublicStockOfferingMember_019c290e-48ab-7af3-bd19-6452cfe14c41" xlink:href="fnf-20251231.xsd#fnf_PublicStockOfferingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-70c1-a485-831ca399260c" xlink:to="loc_fnf_PublicStockOfferingMember_019c290e-48ab-7af3-bd19-6452cfe14c41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OverAllotmentOptionMember_019c290e-48ab-7061-ac13-3ad9abba603f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OverAllotmentOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c290e-48ab-70c1-a485-831ca399260c" xlink:to="loc_us-gaap_OverAllotmentOptionMember_019c290e-48ab-7061-ac13-3ad9abba603f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c290e-48ab-7d4c-bfad-f0db2e5d3cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c290e-48ab-7d4c-bfad-f0db2e5d3cd9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c290e-48ab-7d4c-bfad-f0db2e5d3cd9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c290e-48ab-7d4c-bfad-f0db2e5d3cd9" xlink:to="loc_us-gaap_RelatedPartyDomain_019c290e-48ab-7d4c-bfad-f0db2e5d3cd9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019c290e-48ab-7c46-ac0e-0f9e1ec91a0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019c290e-48ab-7d4c-bfad-f0db2e5d3cd9" xlink:to="loc_us-gaap_RelatedPartyDomain_019c290e-48ab-7c46-ac0e-0f9e1ec91a0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019c290e-48ab-71c1-87d7-521e8d1e0a8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019c290e-48ab-7c46-ac0e-0f9e1ec91a0a" xlink:to="loc_us-gaap_RelatedPartyMember_019c290e-48ab-71c1-87d7-521e8d1e0a8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c290e-48ab-77a5-9142-4ce3681d0ea4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c290e-48ab-77a5-9142-4ce3681d0ea4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c290e-48ab-77a5-9142-4ce3681d0ea4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c290e-48ab-77a5-9142-4ce3681d0ea4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c290e-48ab-77a5-9142-4ce3681d0ea4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c290e-48ab-7a5e-bd16-86dcb4f7f0bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c290e-48ab-77a5-9142-4ce3681d0ea4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c290e-48ab-7a5e-bd16-86dcb4f7f0bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A5.50FGSeniorNotesDueMay2025Member_019c290e-48ab-7717-917d-7d68a2709c1c" xlink:href="fnf-20251231.xsd#fnf_A5.50FGSeniorNotesDueMay2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c290e-48ab-7a5e-bd16-86dcb4f7f0bc" xlink:to="loc_fnf_A5.50FGSeniorNotesDueMay2025Member_019c290e-48ab-7717-917d-7d68a2709c1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A7.30JuniorSubordinatedNotesDue2065Member_019c290e-9616-7d57-b987-cdbe00d9717b" xlink:href="fnf-20251231.xsd#fnf_A7.30JuniorSubordinatedNotesDue2065Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c290e-48ab-7a5e-bd16-86dcb4f7f0bc" xlink:to="loc_fnf_A7.30JuniorSubordinatedNotesDue2065Member_019c290e-9616-7d57-b987-cdbe00d9717b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c290e-48ab-72b2-a5b6-83b8fbfd6aca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c290e-48ab-72b2-a5b6-83b8fbfd6aca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c290e-48ab-72b2-a5b6-83b8fbfd6aca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c290e-48ab-72b2-a5b6-83b8fbfd6aca" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c290e-48ab-72b2-a5b6-83b8fbfd6aca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c290e-48ab-7eec-84a8-85ea4929ab92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c290e-48ab-72b2-a5b6-83b8fbfd6aca" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c290e-48ab-7eec-84a8-85ea4929ab92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019c290e-48ab-7235-917f-4ee4b8a63b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c290e-48ab-7eec-84a8-85ea4929ab92" xlink:to="loc_us-gaap_SeniorNotesMember_019c290e-48ab-7235-917f-4ee4b8a63b8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019c5b04-b983-7686-b8f3-eeb498cac228" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_srt_CounterpartyNameAxis_019c5b04-b983-7686-b8f3-eeb498cac228" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c5b04-b983-7686-b8f3-eeb498cac228_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019c5b04-b983-7686-b8f3-eeb498cac228" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c5b04-b983-7686-b8f3-eeb498cac228_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c5b04-b983-7546-b353-e98611f95a42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019c5b04-b983-7686-b8f3-eeb498cac228" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c5b04-b983-7546-b353-e98611f95a42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGAnnuitiesLifeMemberMember_019c5b04-fe57-70d2-8fdb-6af5a2fdecbe" xlink:href="fnf-20251231.xsd#fnf_FGAnnuitiesLifeMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019c5b04-b983-7546-b353-e98611f95a42" xlink:to="loc_fnf_FGAnnuitiesLifeMemberMember_019c5b04-fe57-70d2-8fdb-6af5a2fdecbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019c9523-ded1-7ca1-aa2d-c11f0a5050e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019c9523-ded1-7ca1-aa2d-c11f0a5050e6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c9523-ded1-7ca1-aa2d-c11f0a5050e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c9523-ded1-7ca1-aa2d-c11f0a5050e6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c9523-ded1-7ca1-aa2d-c11f0a5050e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c9523-ded1-7179-891d-80f053d6f968" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c9523-ded1-7ca1-aa2d-c11f0a5050e6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c9523-ded1-7179-891d-80f053d6f968" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019c9524-0d1a-7d0b-bc15-616c9d1e9ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019c9523-ded1-7179-891d-80f053d6f968" xlink:to="loc_us-gaap_SubsequentEventMember_019c9524-0d1a-7d0b-bc15-616c9d1e9ec8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9539-f7b6-7e8a-8123-8ad3bbda2c97" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e3877529-4363-4127-94f3-9a988d1772da" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9539-f7b6-7e8a-8123-8ad3bbda2c97" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019c9539-f7b6-7e8a-8123-8ad3bbda2c97_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9539-f7b6-7e8a-8123-8ad3bbda2c97" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019c9539-f7b6-7e8a-8123-8ad3bbda2c97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019c9539-f7b6-72c8-9d45-69fd7e1dab9d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019c9539-f7b6-7e8a-8123-8ad3bbda2c97" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019c9539-f7b6-72c8-9d45-69fd7e1dab9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FidelityGuarantyLifeMember_019c953a-804a-7a70-b757-8c1f9f0bbcc5" xlink:href="fnf-20251231.xsd#fnf_FidelityGuarantyLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019c9539-f7b6-72c8-9d45-69fd7e1dab9d" xlink:to="loc_fnf_FidelityGuarantyLifeMember_019c953a-804a-7a70-b757-8c1f9f0bbcc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019c290e-48ab-7169-b79e-04288047246b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019c290e-48ab-7169-b79e-04288047246b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_SharesApprovedForDistributionPercentageOfOutstandingShares_019c290d-dd51-7a31-94de-2b3271261a55" xlink:href="fnf-20251231.xsd#fnf_SharesApprovedForDistributionPercentageOfOutstandingShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_fnf_SharesApprovedForDistributionPercentageOfOutstandingShares_019c290d-dd51-7a31-94de-2b3271261a55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ShareDistributionPerShareConversionRate_019c5b47-27cc-74ba-bb58-3ac7f33c7ff5" xlink:href="fnf-20251231.xsd#fnf_ShareDistributionPerShareConversionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_fnf_ShareDistributionPerShareConversionRate_019c5b47-27cc-74ba-bb58-3ac7f33c7ff5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019c290e-48ab-794a-9005-2b405ba92710" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019c290e-48ab-794a-9005-2b405ba92710" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_SaleOfStockUnderwriterOfferingPeriod_019c290e-48ab-7343-88b9-319a178ad6c9" xlink:href="fnf-20251231.xsd#fnf_SaleOfStockUnderwriterOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_fnf_SaleOfStockUnderwriterOfferingPeriod_019c290e-48ab-7343-88b9-319a178ad6c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019c290e-48ab-7769-8755-871eed0c2ae8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019c290e-48ab-7769-8755-871eed0c2ae8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c290e-48ab-72cf-a570-61591d810e2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c290e-48ab-72cf-a570-61591d810e2a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019c290e-48ab-73db-a27a-ed4a1a525ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019c290e-48ab-73db-a27a-ed4a1a525ca4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019c290e-9616-7201-9ebd-155656ecd634" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019c290e-9616-7201-9ebd-155656ecd634" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_019c9523-2301-7e19-be14-67a731f4e62c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019c290d-dd51-7ada-8fcf-aed783e7a75a" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_019c9523-2301-7e19-be14-67a731f4e62c" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesTradeandNotesReceivableDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#BusinessandSummaryofSignificantAccountingPoliciesTradeandNotesReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesTradeandNotesReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRecognitionMilestoneMethodLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionMilestoneMethodTable_01e495b2-de8a-4216-a9cf-5ce0990e0788" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRecognitionMilestoneMethodTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:to="loc_us-gaap_RevenueRecognitionMilestoneMethodTable_01e495b2-de8a-4216-a9cf-5ce0990e0788" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f2f28b07-1dee-4444-81bc-169c0fc90b1e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodTable_01e495b2-de8a-4216-a9cf-5ce0990e0788" xlink:to="loc_srt_RangeAxis_f2f28b07-1dee-4444-81bc-169c0fc90b1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f2f28b07-1dee-4444-81bc-169c0fc90b1e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f2f28b07-1dee-4444-81bc-169c0fc90b1e" xlink:to="loc_srt_RangeMember_f2f28b07-1dee-4444-81bc-169c0fc90b1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_74bf7fc7-46fb-4bfd-afa9-8dbc829a5ed4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f2f28b07-1dee-4444-81bc-169c0fc90b1e" xlink:to="loc_srt_RangeMember_74bf7fc7-46fb-4bfd-afa9-8dbc829a5ed4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_79051610-1d04-4fda-913f-7ed1a5596563" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_74bf7fc7-46fb-4bfd-afa9-8dbc829a5ed4" xlink:to="loc_srt_MinimumMember_79051610-1d04-4fda-913f-7ed1a5596563" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3e70a8b8-e161-4593-86e8-300bd1dd99c4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_74bf7fc7-46fb-4bfd-afa9-8dbc829a5ed4" xlink:to="loc_srt_MaximumMember_3e70a8b8-e161-4593-86e8-300bd1dd99c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccrualforAgencyPremiumsPercentReportedwithin3Months_3a99ffbc-a2ea-48c0-a845-3d170138e210" xlink:href="fnf-20251231.xsd#fnf_AccrualforAgencyPremiumsPercentReportedwithin3Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:to="loc_fnf_AccrualforAgencyPremiumsPercentReportedwithin3Months_3a99ffbc-a2ea-48c0-a845-3d170138e210" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccrualforAgencyPremiumsPercentReportedin46Months_6d7d223f-68aa-4fee-bdaf-67749db482ab" xlink:href="fnf-20251231.xsd#fnf_AccrualforAgencyPremiumsPercentReportedin46Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:to="loc_fnf_AccrualforAgencyPremiumsPercentReportedin46Months_6d7d223f-68aa-4fee-bdaf-67749db482ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccrualForAgencyPremiumsRemainingTimeLagPeriod_b2f575dc-f5e7-49d9-8030-abb9c8332137" xlink:href="fnf-20251231.xsd#fnf_AccrualForAgencyPremiumsRemainingTimeLagPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:to="loc_fnf_AccrualForAgencyPremiumsRemainingTimeLagPeriod_b2f575dc-f5e7-49d9-8030-abb9c8332137" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InsuranceCommissionsasPercentageofAgentPremiums_5d298fff-5473-447c-95ef-6b65e38d89b8" xlink:href="fnf-20251231.xsd#fnf_InsuranceCommissionsasPercentageofAgentPremiums"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:to="loc_fnf_InsuranceCommissionsasPercentageofAgentPremiums_5d298fff-5473-447c-95ef-6b65e38d89b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PremiumsReceivableNetofAccruedSalesCommissions_37fac2e3-13fd-4a27-9f7c-bef6295ebdc8" xlink:href="fnf-20251231.xsd#fnf_PremiumsReceivableNetofAccruedSalesCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionMilestoneMethodLineItems_04128765-03d6-4c47-9cc8-7f4ee7e37f24" xlink:to="loc_fnf_PremiumsReceivableNetofAccruedSalesCommissions_37fac2e3-13fd-4a27-9f7c-bef6295ebdc8" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesOtherIntangibleAssetsandGoodwillIntangibleAssetsandPropertyandEquipmentDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#BusinessandSummaryofSignificantAccountingPoliciesOtherIntangibleAssetsandGoodwillIntangibleAssetsandPropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesOtherIntangibleAssetsandGoodwillIntangibleAssetsandPropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_43e7b4cd-11bd-454f-a265-eb3e9502a948" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_3bafefed-d271-442a-9f0d-15004d4868b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_43e7b4cd-11bd-454f-a265-eb3e9502a948" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_3bafefed-d271-442a-9f0d-15004d4868b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a544b0f8-71f7-4550-a2bb-ce1d1111d0a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_3bafefed-d271-442a-9f0d-15004d4868b5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a544b0f8-71f7-4550-a2bb-ce1d1111d0a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a544b0f8-71f7-4550-a2bb-ce1d1111d0a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a544b0f8-71f7-4550-a2bb-ce1d1111d0a7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a544b0f8-71f7-4550-a2bb-ce1d1111d0a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a676aa1a-8202-4203-8c15-4d6f169c3ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a544b0f8-71f7-4550-a2bb-ce1d1111d0a7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a676aa1a-8202-4203-8c15-4d6f169c3ef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_74dfbdda-11a5-4944-9f87-019e44d3a65f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a676aa1a-8202-4203-8c15-4d6f169c3ef6" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_74dfbdda-11a5-4944-9f87-019e44d3a65f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bf6672d4-b9c6-4e78-a8d2-ad454377f4d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_3bafefed-d271-442a-9f0d-15004d4868b5" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bf6672d4-b9c6-4e78-a8d2-ad454377f4d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_bf6672d4-b9c6-4e78-a8d2-ad454377f4d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bf6672d4-b9c6-4e78-a8d2-ad454377f4d2" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_bf6672d4-b9c6-4e78-a8d2-ad454377f4d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_e6b8aa98-c544-4c24-abf3-d8c803aa71bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_bf6672d4-b9c6-4e78-a8d2-ad454377f4d2" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_e6b8aa98-c544-4c24-abf3-d8c803aa71bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitlePlantMember_c7657cd1-28b8-4a15-8810-7dae2564147c" xlink:href="fnf-20251231.xsd#fnf_TitlePlantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_e6b8aa98-c544-4c24-abf3-d8c803aa71bf" xlink:to="loc_fnf_TitlePlantMember_c7657cd1-28b8-4a15-8810-7dae2564147c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_117576a0-ba2a-445d-b040-254c92d09bfb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_3bafefed-d271-442a-9f0d-15004d4868b5" xlink:to="loc_srt_RangeAxis_117576a0-ba2a-445d-b040-254c92d09bfb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_117576a0-ba2a-445d-b040-254c92d09bfb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_117576a0-ba2a-445d-b040-254c92d09bfb" xlink:to="loc_srt_RangeMember_117576a0-ba2a-445d-b040-254c92d09bfb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_49b92b37-d31d-49ae-97ea-ed9bd8b41dfa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_117576a0-ba2a-445d-b040-254c92d09bfb" xlink:to="loc_srt_RangeMember_49b92b37-d31d-49ae-97ea-ed9bd8b41dfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_0da55266-3563-4950-ab83-e2cec4d5d687" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_49b92b37-d31d-49ae-97ea-ed9bd8b41dfa" xlink:to="loc_srt_MinimumMember_0da55266-3563-4950-ab83-e2cec4d5d687" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0eb85d7e-0ef6-4eba-b069-694b44c1e8af" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_49b92b37-d31d-49ae-97ea-ed9bd8b41dfa" xlink:to="loc_srt_MaximumMember_0eb85d7e-0ef6-4eba-b069-694b44c1e8af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a68af4d-df88-42d7-a96d-15f183ccc368" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_3bafefed-d271-442a-9f0d-15004d4868b5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a68af4d-df88-42d7-a96d-15f183ccc368" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4a68af4d-df88-42d7-a96d-15f183ccc368_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a68af4d-df88-42d7-a96d-15f183ccc368" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4a68af4d-df88-42d7-a96d-15f183ccc368_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_cad14cd2-bbb7-49f1-8eb1-590679835561" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a68af4d-df88-42d7-a96d-15f183ccc368" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_cad14cd2-bbb7-49f1-8eb1-590679835561" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_b5b5ad6d-c920-4ca7-b689-f0c154be6b23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_cad14cd2-bbb7-49f1-8eb1-590679835561" xlink:to="loc_us-gaap_BuildingMember_b5b5ad6d-c920-4ca7-b689-f0c154be6b23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FurnitureFixtureAndEquipmentMember_fc6c2738-3683-459a-a254-4d4e58a89450" xlink:href="fnf-20251231.xsd#fnf_FurnitureFixtureAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_cad14cd2-bbb7-49f1-8eb1-590679835561" xlink:to="loc_fnf_FurnitureFixtureAndEquipmentMember_fc6c2738-3683-459a-a254-4d4e58a89450" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_76cace11-15ff-467a-84e7-432e9bb528c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_43e7b4cd-11bd-454f-a265-eb3e9502a948" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_76cace11-15ff-467a-84e7-432e9bb528c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_09eb9697-7ce4-4ebc-b29a-c763beb7e048" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_43e7b4cd-11bd-454f-a265-eb3e9502a948" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_09eb9697-7ce4-4ebc-b29a-c763beb7e048" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_23231aa5-8f26-4e9c-8a87-470d309fcc9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_43e7b4cd-11bd-454f-a265-eb3e9502a948" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_23231aa5-8f26-4e9c-8a87-470d309fcc9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_8ae71a77-5d75-4c13-8c11-a77eab785c9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_43e7b4cd-11bd-454f-a265-eb3e9502a948" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_8ae71a77-5d75-4c13-8c11-a77eab785c9d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesScheduleofChangesinOtherComprehensiveEarningsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#BusinessandSummaryofSignificantAccountingPoliciesScheduleofChangesinOtherComprehensiveEarningsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesScheduleofChangesinOtherComprehensiveEarningsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_b2bf4621-e991-4a19-9074-de401ca62b8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_b2bf4621-e991-4a19-9074-de401ca62b8b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_357bbab1-0888-49ca-a6f5-7de4abd88adb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_b2bf4621-e991-4a19-9074-de401ca62b8b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_357bbab1-0888-49ca-a6f5-7de4abd88adb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_357bbab1-0888-49ca-a6f5-7de4abd88adb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_357bbab1-0888-49ca-a6f5-7de4abd88adb" xlink:to="loc_us-gaap_EquityComponentDomain_357bbab1-0888-49ca-a6f5-7de4abd88adb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_357bbab1-0888-49ca-a6f5-7de4abd88adb" xlink:to="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_a0794371-c3d6-44de-ba45-0b16e5001bef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_a0794371-c3d6-44de-ba45-0b16e5001bef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccumulatedNetInvestmentGainLossonEquityMethodInvestmentsArisingDuringPeriodAttributabletoParentMember_90e460af-f644-4510-8c42-5695c247bebe" xlink:href="fnf-20251231.xsd#fnf_AccumulatedNetInvestmentGainLossonEquityMethodInvestmentsArisingDuringPeriodAttributabletoParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:to="loc_fnf_AccumulatedNetInvestmentGainLossonEquityMethodInvestmentsArisingDuringPeriodAttributabletoParentMember_90e460af-f644-4510-8c42-5695c247bebe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_30671ccf-d527-4892-aa76-d33f6215be9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_30671ccf-d527-4892-aa76-d33f6215be9c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_d2f29957-3232-4e2e-af6a-b8e0df80bd2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_d2f29957-3232-4e2e-af6a-b8e0df80bd2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6241a3de-0abb-4cdc-92c9-336ae83d6b63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_70d9f8ff-4674-4321-bc03-585cdf2455ab" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6241a3de-0abb-4cdc-92c9-336ae83d6b63" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_b43f27be-94b1-49c8-9f0c-55444f75205a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:to="loc_us-gaap_StockholdersEquity_b43f27be-94b1-49c8-9f0c-55444f75205a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_ef5363a8-a8fc-473e-be7a-a61d78263ce3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_ef5363a8-a8fc-473e-be7a-a61d78263ce3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_699fec14-cbd3-4258-adcf-61b6fa88aa60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_699fec14-cbd3-4258-adcf-61b6fa88aa60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NoncontrollingInterestDistributionsToNoncontrollingInterestHolders_019c5b31-b561-7e9f-abe5-551623e341d0" xlink:href="fnf-20251231.xsd#fnf_NoncontrollingInterestDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:to="loc_fnf_NoncontrollingInterestDistributionsToNoncontrollingInterestHolders_019c5b31-b561-7e9f-abe5-551623e341d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterestSpinoff_f64b0949-debf-412d-823c-1df6b4b98e14" xlink:href="fnf-20251231.xsd#fnf_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterestSpinoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_810074df-9b0a-4254-8512-61b8887d3a4e" xlink:to="loc_fnf_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterestSpinoff_f64b0949-debf-412d-823c-1df6b4b98e14" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ee551f08-2f20-403e-96d9-9bf57566efe5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesOwnedDistributionInvestmentsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#BusinessandSummaryofSignificantAccountingPoliciesOwnedDistributionInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/BusinessandSummaryofSignificantAccountingPoliciesOwnedDistributionInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_104c9681-9803-45f6-b7bc-865503fecd18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb54a592-d21d-4a45-a6ed-ccf35b144b52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_104c9681-9803-45f6-b7bc-865503fecd18" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb54a592-d21d-4a45-a6ed-ccf35b144b52" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_31a4d177-a12b-44c1-8b14-d71b9179e4a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_eb54a592-d21d-4a45-a6ed-ccf35b144b52" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_31a4d177-a12b-44c1-8b14-d71b9179e4a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_31a4d177-a12b-44c1-8b14-d71b9179e4a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_31a4d177-a12b-44c1-8b14-d71b9179e4a7" xlink:to="loc_us-gaap_RelatedPartyDomain_31a4d177-a12b-44c1-8b14-d71b9179e4a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1bce76d8-b5a9-4f82-b5ba-b7594a55a6a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_31a4d177-a12b-44c1-8b14-d71b9179e4a7" xlink:to="loc_us-gaap_RelatedPartyDomain_1bce76d8-b5a9-4f82-b5ba-b7594a55a6a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_f0c18f05-e091-44b0-8973-b7acc1a65700" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_1bce76d8-b5a9-4f82-b5ba-b7594a55a6a2" xlink:to="loc_srt_AffiliatedEntityMember_f0c18f05-e091-44b0-8973-b7acc1a65700" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissions_e70f225b-4023-41c5-8016-1cd7e43e56a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_104c9681-9803-45f6-b7bc-865503fecd18" xlink:to="loc_us-gaap_InsuranceCommissions_e70f225b-4023-41c5-8016-1cd7e43e56a0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/SummaryofReserveforTitleClaimLossesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#SummaryofReserveforTitleClaimLossesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/SummaryofReserveforTitleClaimLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_265a666e-10d0-48f0-b658-24e25f736691" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_177f2668-c7cd-4117-8adf-41ae48497f80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_265a666e-10d0-48f0-b658-24e25f736691" xlink:to="loc_us-gaap_LossContingenciesTable_177f2668-c7cd-4117-8adf-41ae48497f80" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ae668d51-38ca-4c2e-bc38-f3a37ee6ef5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_177f2668-c7cd-4117-8adf-41ae48497f80" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ae668d51-38ca-4c2e-bc38-f3a37ee6ef5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ae668d51-38ca-4c2e-bc38-f3a37ee6ef5c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ae668d51-38ca-4c2e-bc38-f3a37ee6ef5c" xlink:to="loc_us-gaap_SegmentDomain_ae668d51-38ca-4c2e-bc38-f3a37ee6ef5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d295f0c3-ff88-4a69-a66b-2189f540444c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ae668d51-38ca-4c2e-bc38-f3a37ee6ef5c" xlink:to="loc_us-gaap_SegmentDomain_d295f0c3-ff88-4a69-a66b-2189f540444c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleSegmentMember_1b36ddb2-b0a0-4dfd-a7ef-2c8e86801a68" xlink:href="fnf-20251231.xsd#fnf_TitleSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d295f0c3-ff88-4a69-a66b-2189f540444c" xlink:to="loc_fnf_TitleSegmentMember_1b36ddb2-b0a0-4dfd-a7ef-2c8e86801a68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_265a666e-10d0-48f0-b658-24e25f736691" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_abd2e2a4-2863-425b-9c6b-0fa7a7651ae3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:to="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_abd2e2a4-2863-425b-9c6b-0fa7a7651ae3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReinsuranceRecoverable_0ff70576-274c-470a-a71d-47855fcaa0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInReinsuranceRecoverable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:to="loc_us-gaap_IncreaseDecreaseInReinsuranceRecoverable_0ff70576-274c-470a-a71d-47855fcaa0e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_106d574f-d9a0-40fe-a484-dc3235e438eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_106d574f-d9a0-40fe-a484-dc3235e438eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_fd3bea07-fdf3-4777-977a-a49cb790b6f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_106d574f-d9a0-40fe-a484-dc3235e438eb" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_fd3bea07-fdf3-4777-977a-a49cb790b6f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_ef0c6dbc-3df0-4096-8970-60432ce722e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_106d574f-d9a0-40fe-a484-dc3235e438eb" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_ef0c6dbc-3df0-4096-8970-60432ce722e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_b90e1a28-775a-4fe6-b360-35f41162ab37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsAbstract_106d574f-d9a0-40fe-a484-dc3235e438eb" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_b90e1a28-775a-4fe6-b360-35f41162ab37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_0cbfefef-5859-4831-bd8e-a010380d6abd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_0cbfefef-5859-4831-bd8e-a010380d6abd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_b3b6b3df-29ec-4d71-93ba-2011d567f375" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_0cbfefef-5859-4831-bd8e-a010380d6abd" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_b3b6b3df-29ec-4d71-93ba-2011d567f375" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_f68d2150-a6aa-4459-8f7a-c85ce0245425" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_0cbfefef-5859-4831-bd8e-a010380d6abd" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_f68d2150-a6aa-4459-8f7a-c85ce0245425" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_d7fa9d54-2f7a-4fd0-a703-20637be369f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForLossesAndLossAdjustmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAbstract_0cbfefef-5859-4831-bd8e-a010380d6abd" xlink:to="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_d7fa9d54-2f7a-4fd0-a703-20637be369f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_4904fd41-7998-4556-8142-6fd2ef5ff300" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ProvisionForTitleInsuranceClaimsOnCurrentYearPolicies_e3927583-da14-4692-9564-7e0e0cfc09a2" xlink:href="fnf-20251231.xsd#fnf_ProvisionForTitleInsuranceClaimsOnCurrentYearPolicies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNetAbstract_49d0e132-ae7d-440c-9983-9c4f6b35c61d" xlink:to="loc_fnf_ProvisionForTitleInsuranceClaimsOnCurrentYearPolicies_e3927583-da14-4692-9564-7e0e0cfc09a2" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FairValueofFinancialInstrumentsCarryingAmountsofAssetsandLiabilitiesatEstimatedFairValueMeasuredonaRecurringBasisDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FairValueofFinancialInstrumentsCarryingAmountsofAssetsandLiabilitiesatEstimatedFairValueMeasuredonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FairValueofFinancialInstrumentsCarryingAmountsofAssetsandLiabilitiesatEstimatedFairValueMeasuredonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_5de21e01-d536-4276-a7ed-3df9deca798a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_47902545-98a3-4100-b6cf-eeb5734a1fae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_5de21e01-d536-4276-a7ed-3df9deca798a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_47902545-98a3-4100-b6cf-eeb5734a1fae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_90af2df5-2cf9-43b4-907f-8c07e4476ded" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_47902545-98a3-4100-b6cf-eeb5734a1fae" xlink:to="loc_us-gaap_FinancialInstrumentAxis_90af2df5-2cf9-43b4-907f-8c07e4476ded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_90af2df5-2cf9-43b4-907f-8c07e4476ded_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_90af2df5-2cf9-43b4-907f-8c07e4476ded" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_90af2df5-2cf9-43b4-907f-8c07e4476ded_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_90af2df5-2cf9-43b4-907f-8c07e4476ded" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_cba78cbb-b387-46fb-b694-f081466036fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_cba78cbb-b387-46fb-b694-f081466036fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_f4337f27-a5e9-4f55-81c0-4851b1bc4e96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_f4337f27-a5e9-4f55-81c0-4851b1bc4e96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_e73d9563-990e-4500-ae1f-7cb15c5542ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_e73d9563-990e-4500-ae1f-7cb15c5542ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_HybridsMember_afa23ad8-0d2a-46dc-9736-1734c3371eb8" xlink:href="fnf-20251231.xsd#fnf_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_fnf_HybridsMember_afa23ad8-0d2a-46dc-9736-1734c3371eb8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MunicipalsMember_b7308af2-8c0f-4490-8124-b18c288b8ac9" xlink:href="fnf-20251231.xsd#fnf_MunicipalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_fnf_MunicipalsMember_b7308af2-8c0f-4490-8124-b18c288b8ac9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_c40bf257-e36e-47ba-aa42-9c704dd13452" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_c40bf257-e36e-47ba-aa42-9c704dd13452" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_673dcaf1-dbc7-46c4-ada3-55b862401def" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_673dcaf1-dbc7-46c4-ada3-55b862401def" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_0659387d-05d1-4b2c-8bad-dfac72193f45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_0659387d-05d1-4b2c-8bad-dfac72193f45" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_9ea15ea1-4494-4bb6-9b45-4e5cabdb7a21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_PreferredStockMember_9ea15ea1-4494-4bb6-9b45-4e5cabdb7a21" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_20f9b401-14dc-4ae0-a7df-34744ed5453f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_CommonStockMember_20f9b401-14dc-4ae0-a7df-34744ed5453f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestmentsMember_098b700c-5ea0-45d8-a588-ea4fb7e8fa4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_27198f1d-2741-4b13-817e-caa4fb6dd4e4" xlink:to="loc_us-gaap_OtherLongTermInvestmentsMember_098b700c-5ea0-45d8-a588-ea4fb7e8fa4c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_68fd898b-ad0d-42ed-8704-65d8e29e69eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_47902545-98a3-4100-b6cf-eeb5734a1fae" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_68fd898b-ad0d-42ed-8704-65d8e29e69eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_68fd898b-ad0d-42ed-8704-65d8e29e69eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_68fd898b-ad0d-42ed-8704-65d8e29e69eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_68fd898b-ad0d-42ed-8704-65d8e29e69eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_68fd898b-ad0d-42ed-8704-65d8e29e69eb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_7ab5df65-21e7-4294-bc46-612958f3b342" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:to="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_7ab5df65-21e7-4294-bc46-612958f3b342" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ForeignCurrencySwapsAndOtherDerivativesMember_019c9400-9a09-7f83-bca2-73cdeb69644b" xlink:href="fnf-20251231.xsd#fnf_ForeignCurrencySwapsAndOtherDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:to="loc_fnf_ForeignCurrencySwapsAndOtherDerivativesMember_019c9400-9a09-7f83-bca2-73cdeb69644b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ReinsuranceRelatedEmbeddedDerivativeMember_019c5b67-ae58-7ab6-86eb-aab50e505ec1" xlink:href="fnf-20251231.xsd#fnf_ReinsuranceRelatedEmbeddedDerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:to="loc_fnf_ReinsuranceRelatedEmbeddedDerivativeMember_019c5b67-ae58-7ab6-86eb-aab50e505ec1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CallOptionMember_7d63557b-ecf7-44c1-9d3e-8612a4e07722" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CallOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:to="loc_us-gaap_CallOptionMember_7d63557b-ecf7-44c1-9d3e-8612a4e07722" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EmbeddedDerivativesInReinsuranceContractsMember_019c5b69-850e-7cb6-aa52-6b232b2ffbd1" xlink:href="fnf-20251231.xsd#fnf_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_0cadebd4-22b3-4378-9e9d-d222bd2dfc93" xlink:to="loc_fnf_EmbeddedDerivativesInReinsuranceContractsMember_019c5b69-850e-7cb6-aa52-6b232b2ffbd1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_7d0ab62b-18ed-485d-a4b5-f3f72fc020a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_47902545-98a3-4100-b6cf-eeb5734a1fae" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_7d0ab62b-18ed-485d-a4b5-f3f72fc020a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7d0ab62b-18ed-485d-a4b5-f3f72fc020a8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7d0ab62b-18ed-485d-a4b5-f3f72fc020a8" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_7d0ab62b-18ed-485d-a4b5-f3f72fc020a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1d2aa1f2-f716-4957-9ab7-50a1437d460f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7d0ab62b-18ed-485d-a4b5-f3f72fc020a8" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1d2aa1f2-f716-4957-9ab7-50a1437d460f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c1056ac9-8995-4a83-aba7-a73f3da4ac64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1d2aa1f2-f716-4957-9ab7-50a1437d460f" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c1056ac9-8995-4a83-aba7-a73f3da4ac64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_54f7c71a-6e65-4520-94a4-886264461ada" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c1056ac9-8995-4a83-aba7-a73f3da4ac64" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_54f7c71a-6e65-4520-94a4-886264461ada" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8e191f9a-000d-4c10-810d-807dd919cd63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_47902545-98a3-4100-b6cf-eeb5734a1fae" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8e191f9a-000d-4c10-810d-807dd919cd63" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8e191f9a-000d-4c10-810d-807dd919cd63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8e191f9a-000d-4c10-810d-807dd919cd63" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8e191f9a-000d-4c10-810d-807dd919cd63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_77abfde6-6c1b-40d7-9cec-3a9dccd24884" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8e191f9a-000d-4c10-810d-807dd919cd63" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_77abfde6-6c1b-40d7-9cec-3a9dccd24884" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_cb7d81ac-52a0-47e0-8b83-c870bc0730d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_77abfde6-6c1b-40d7-9cec-3a9dccd24884" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_cb7d81ac-52a0-47e0-8b83-c870bc0730d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_de9f7d65-ba56-4b1e-a81b-42fbbd3409b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_77abfde6-6c1b-40d7-9cec-3a9dccd24884" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_de9f7d65-ba56-4b1e-a81b-42fbbd3409b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_b902b14c-a2f6-4bd0-a7e8-c0a56728c0b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_77abfde6-6c1b-40d7-9cec-3a9dccd24884" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_b902b14c-a2f6-4bd0-a7e8-c0a56728c0b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_ccaca6cb-2d6d-477e-8d5a-e3554aa710d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_77abfde6-6c1b-40d7-9cec-3a9dccd24884" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_ccaca6cb-2d6d-477e-8d5a-e3554aa710d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_5de21e01-d536-4276-a7ed-3df9deca798a" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_954bb410-2119-4f4b-9240-14441ec81b15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_954bb410-2119-4f4b-9240-14441ec81b15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_a01bd4c7-02e9-4b36-ae16-fa9b6fc1d631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_a01bd4c7-02e9-4b36-ae16-fa9b6fc1d631" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_16a227dc-0656-45f0-bf6b-fc165756c068" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_16a227dc-0656-45f0-bf6b-fc165756c068" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_8fb28367-ca6b-49eb-84a4-bfcac0101cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_DerivativeAssets_8fb28367-ca6b-49eb-84a4-bfcac0101cbd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_96bc23b6-a7f8-4177-aac8-b6721749e91c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_96bc23b6-a7f8-4177-aac8-b6721749e91c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_880fb386-257d-4a96-b136-520ac73c9fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_880fb386-257d-4a96-b136-520ac73c9fc1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ShortTermInvestmentsFairValue_90f57203-dd70-4c33-abd8-ffb135947355" xlink:href="fnf-20251231.xsd#fnf_ShortTermInvestmentsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_fnf_ShortTermInvestmentsFairValue_90f57203-dd70-4c33-abd8-ffb135947355" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesIncludedInReinsuranceRecoverable_019c5b4b-6010-71d0-9bf9-fc8c01b87bb3" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesIncludedInReinsuranceRecoverable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesIncludedInReinsuranceRecoverable_019c5b4b-6010-71d0-9bf9-fc8c01b87bb3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure_31bdad39-0195-4c76-9ce7-bd656b30dc75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_NotesReceivableFairValueDisclosure_31bdad39-0195-4c76-9ce7-bd656b30dc75" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_9d689ba0-f965-41e8-aa12-18689d2a9f48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_9d689ba0-f965-41e8-aa12-18689d2a9f48" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_3de13f1a-a7c3-40fc-84e3-b0876cfe2702" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_9b53e698-4e2d-4155-a07a-4a615cdec23d" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_3de13f1a-a7c3-40fc-84e3-b0876cfe2702" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_32fc6e82-4cb1-4e76-81ee-4eaf50791c3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_5de21e01-d536-4276-a7ed-3df9deca798a" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_32fc6e82-4cb1-4e76-81ee-4eaf50791c3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_c24e336e-6a3e-4fd0-9442-0f2ff13858ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_32fc6e82-4cb1-4e76-81ee-4eaf50791c3a" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_c24e336e-6a3e-4fd0-9442-0f2ff13858ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_23c38d57-95c7-4881-9d5e-49758cd5947e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_c24e336e-6a3e-4fd0-9442-0f2ff13858ea" xlink:to="loc_us-gaap_DerivativeLiabilities_23c38d57-95c7-4881-9d5e-49758cd5947e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EmbeddedDerivativeLiabilityNet_019c5b69-850e-77b6-b420-aa2ef8a7a18c" xlink:href="fnf-20251231.xsd#fnf_EmbeddedDerivativeLiabilityNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_c24e336e-6a3e-4fd0-9442-0f2ff13858ea" xlink:to="loc_fnf_EmbeddedDerivativeLiabilityNet_019c5b69-850e-77b6-b420-aa2ef8a7a18c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_30c570f6-435d-4a59-82e2-e73d72519d5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_32fc6e82-4cb1-4e76-81ee-4eaf50791c3a" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_30c570f6-435d-4a59-82e2-e73d72519d5a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_1bb19842-9b5c-4831-80b5-70176d197157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_32fc6e82-4cb1-4e76-81ee-4eaf50791c3a" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_1bb19842-9b5c-4831-80b5-70176d197157" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_69c847c0-8c35-4e61-a3b8-9921577d1c9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_5de21e01-d536-4276-a7ed-3df9deca798a" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_69c847c0-8c35-4e61-a3b8-9921577d1c9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancialLiabilitiesNetFairValueDisclosure_019c9511-9b32-7e1c-895c-d0e5906b9ae8" xlink:href="fnf-20251231.xsd#fnf_FinancialLiabilitiesNetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_5de21e01-d536-4276-a7ed-3df9deca798a" xlink:to="loc_fnf_FinancialLiabilitiesNetFairValueDisclosure_019c9511-9b32-7e1c-895c-d0e5906b9ae8" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FairValueofFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_365b0635-9be7-4056-8042-d1946cead712" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f832421a-73c9-4ac4-b805-9511d0995552" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_365b0635-9be7-4056-8042-d1946cead712" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f832421a-73c9-4ac4-b805-9511d0995552" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_67c60fcb-3552-444d-9522-1a5ba39059a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f832421a-73c9-4ac4-b805-9511d0995552" xlink:to="loc_us-gaap_FinancialInstrumentAxis_67c60fcb-3552-444d-9522-1a5ba39059a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_67c60fcb-3552-444d-9522-1a5ba39059a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_67c60fcb-3552-444d-9522-1a5ba39059a9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_67c60fcb-3552-444d-9522-1a5ba39059a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8bd7af89-3b26-42c5-b178-08650d025a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_67c60fcb-3552-444d-9522-1a5ba39059a9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8bd7af89-3b26-42c5-b178-08650d025a4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditLinkedNoteMember_aadd18db-528a-4146-acf1-cdd564b45f3f" xlink:href="fnf-20251231.xsd#fnf_CreditLinkedNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8bd7af89-3b26-42c5-b178-08650d025a4b" xlink:to="loc_fnf_CreditLinkedNoteMember_aadd18db-528a-4146-acf1-cdd564b45f3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_f385baa5-c01c-4b2f-ba67-d03232c3520a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f832421a-73c9-4ac4-b805-9511d0995552" xlink:to="loc_us-gaap_ValuationTechniqueAxis_f385baa5-c01c-4b2f-ba67-d03232c3520a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_f385baa5-c01c-4b2f-ba67-d03232c3520a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_f385baa5-c01c-4b2f-ba67-d03232c3520a" xlink:to="loc_us-gaap_ValuationTechniqueDomain_f385baa5-c01c-4b2f-ba67-d03232c3520a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_8bbb302f-63c2-4c3e-b66b-c0aa87faa23e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_f385baa5-c01c-4b2f-ba67-d03232c3520a" xlink:to="loc_us-gaap_ValuationTechniqueDomain_8bbb302f-63c2-4c3e-b66b-c0aa87faa23e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeApproachValuationTechniqueMember_39361965-de0c-4553-9c9a-f22391f0c8da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_8bbb302f-63c2-4c3e-b66b-c0aa87faa23e" xlink:to="loc_us-gaap_IncomeApproachValuationTechniqueMember_39361965-de0c-4553-9c9a-f22391f0c8da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c9816-e19d-7b4c-9b7a-db86a21994f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_f832421a-73c9-4ac4-b805-9511d0995552" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c9816-e19d-7b4c-9b7a-db86a21994f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9816-e19d-7b4c-9b7a-db86a21994f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9816-e19d-7b4c-9b7a-db86a21994f9" xlink:to="loc_us-gaap_SegmentDomain_019c9816-e19d-7b4c-9b7a-db86a21994f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c9816-e19d-7e4c-94ff-47a934c29e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c9816-e19d-7b4c-9b7a-db86a21994f9" xlink:to="loc_us-gaap_SegmentDomain_019c9816-e19d-7e4c-94ff-47a934c29e4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleSegmentMember_019c9816-e19d-755d-b05c-ff143ebd5e00" xlink:href="fnf-20251231.xsd#fnf_TitleSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c9816-e19d-7e4c-94ff-47a934c29e4f" xlink:to="loc_fnf_TitleSegmentMember_019c9816-e19d-755d-b05c-ff143ebd5e00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativePriceRiskOptionStrikePrice_7ff011b7-78b7-4290-a181-c09566dc619b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativePriceRiskOptionStrikePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_365b0635-9be7-4056-8042-d1946cead712" xlink:to="loc_us-gaap_DerivativePriceRiskOptionStrikePrice_7ff011b7-78b7-4290-a181-c09566dc619b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_68a7a325-1d8f-444b-a254-ccfd7341bd6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_365b0635-9be7-4056-8042-d1946cead712" xlink:to="loc_us-gaap_EquityMethodInvestments_68a7a325-1d8f-444b-a254-ccfd7341bd6c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FairValueofFinancialInstrumentsQuantitativeInformationofUnobservableInputsUsedforLevelThreeFairValueMeasurementsofFinancialInstrumentsonRecurringBasisDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FairValueofFinancialInstrumentsQuantitativeInformationofUnobservableInputsUsedforLevelThreeFairValueMeasurementsofFinancialInstrumentsonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FairValueofFinancialInstrumentsQuantitativeInformationofUnobservableInputsUsedforLevelThreeFairValueMeasurementsofFinancialInstrumentsonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_3d045d08-4101-4827-893d-394d59a4ef2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:to="loc_us-gaap_FinancialInstrumentAxis_3d045d08-4101-4827-893d-394d59a4ef2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d045d08-4101-4827-893d-394d59a4ef2b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3d045d08-4101-4827-893d-394d59a4ef2b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3d045d08-4101-4827-893d-394d59a4ef2b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3d045d08-4101-4827-893d-394d59a4ef2b" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_8c80dbde-add5-4a56-979d-a0ec4ddb4d1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_8c80dbde-add5-4a56-979d-a0ec4ddb4d1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_15883c2d-0591-4b98-a0b8-77e3f1e2b576" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_15883c2d-0591-4b98-a0b8-77e3f1e2b576" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_57eed33c-26d1-4f32-97c9-19a093b16b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_57eed33c-26d1-4f32-97c9-19a093b16b3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_d97ab387-d84c-44b4-9813-a67a66d3728f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_d97ab387-d84c-44b4-9813-a67a66d3728f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c5bd5-3636-7fdd-a616-57d6705a8c07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019c5bd5-3636-7fdd-a616-57d6705a8c07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_0c3c4072-f4af-49f6-8887-172b731d410c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_0c3c4072-f4af-49f6-8887-172b731d410c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_fcd8360a-88db-43c2-b5f3-f4ec629334b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_PreferredStockMember_fcd8360a-88db-43c2-b5f3-f4ec629334b2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c7340-8358-7ec8-aaa8-05986d468943" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_CommonStockMember_019c7340-8358-7ec8-aaa8-05986d468943" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_019b719e-55ca-7ef7-a104-b01c42d286b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_us-gaap_OtherAssetsMember_019b719e-55ca-7ef7-a104-b01c42d286b9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MortgageServicingRightMember_019b2ca7-128e-70ab-ab3c-e0491c9f6f8e" xlink:href="fnf-20251231.xsd#fnf_MortgageServicingRightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_MortgageServicingRightMember_019b2ca7-128e-70ab-ab3c-e0491c9f6f8e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EmbeddedDerivativeOtherLongTermInvestmentsAvailableForSaleMember_bd8f6c8d-db95-4c6b-919b-348d1d7e82eb" xlink:href="fnf-20251231.xsd#fnf_EmbeddedDerivativeOtherLongTermInvestmentsAvailableForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_EmbeddedDerivativeOtherLongTermInvestmentsAvailableForSaleMember_bd8f6c8d-db95-4c6b-919b-348d1d7e82eb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019c736a-7373-78aa-929f-d3caa7024105" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019c736a-7373-78aa-929f-d3caa7024105" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LoanReceivableCommitmentAdvancesMember_f597c5b3-299f-4c0c-aade-c2cfd7c03c3d" xlink:href="fnf-20251231.xsd#fnf_LoanReceivableCommitmentAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_LoanReceivableCommitmentAdvancesMember_f597c5b3-299f-4c0c-aade-c2cfd7c03c3d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitAssetMember_3e7b5232-f345-42f2-a591-eb1c81682fb6" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_MarketRiskBenefitAssetMember_3e7b5232-f345-42f2-a591-eb1c81682fb6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ContingentConsiderationMember_88c78873-5800-425a-8621-5f71681c8a34" xlink:href="fnf-20251231.xsd#fnf_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_ContingentConsiderationMember_88c78873-5800-425a-8621-5f71681c8a34" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitLiabilityMember_b3a916d2-ac69-4013-9b1b-67464ba42e9f" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8b0cd2e5-ac96-48b2-8096-c6627248aaa9" xlink:to="loc_fnf_MarketRiskBenefitLiabilityMember_b3a916d2-ac69-4013-9b1b-67464ba42e9f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b24fe029-8308-432b-806b-09421493d2a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b24fe029-8308-432b-806b-09421493d2a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_b24fe029-8308-432b-806b-09421493d2a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b24fe029-8308-432b-806b-09421493d2a3" xlink:to="loc_us-gaap_RelatedPartyDomain_b24fe029-8308-432b-806b-09421493d2a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_85c28acf-3c6c-4a4c-8de6-346a33cf84cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b24fe029-8308-432b-806b-09421493d2a3" xlink:to="loc_us-gaap_RelatedPartyDomain_85c28acf-3c6c-4a4c-8de6-346a33cf84cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_a1bc4f41-6f72-4f19-a4a8-e545f60f3094" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_85c28acf-3c6c-4a4c-8de6-346a33cf84cf" xlink:to="loc_srt_AffiliatedEntityMember_a1bc4f41-6f72-4f19-a4a8-e545f60f3094" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_ab618a0f-4925-4083-ac52-28f4dbd04b79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_ab618a0f-4925-4083-ac52-28f4dbd04b79" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ab618a0f-4925-4083-ac52-28f4dbd04b79_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_ab618a0f-4925-4083-ac52-28f4dbd04b79" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ab618a0f-4925-4083-ac52-28f4dbd04b79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_61b3b625-aaf4-47da-89af-157c7fccafd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_ab618a0f-4925-4083-ac52-28f4dbd04b79" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_61b3b625-aaf4-47da-89af-157c7fccafd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_0cc3389d-75d6-435f-96c0-c8861bc47cc1" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_61b3b625-aaf4-47da-89af-157c7fccafd6" xlink:to="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_0cc3389d-75d6-435f-96c0-c8861bc47cc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_8217d56b-e956-475e-b407-807d14e147ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:to="loc_us-gaap_ValuationTechniqueAxis_8217d56b-e956-475e-b407-807d14e147ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_8217d56b-e956-475e-b407-807d14e147ef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_8217d56b-e956-475e-b407-807d14e147ef" xlink:to="loc_us-gaap_ValuationTechniqueDomain_8217d56b-e956-475e-b407-807d14e147ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_e854d57b-583e-4c7a-97d2-25c8e947ab1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_8217d56b-e956-475e-b407-807d14e147ef" xlink:to="loc_us-gaap_ValuationTechniqueDomain_e854d57b-583e-4c7a-97d2-25c8e947ab1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ThirdPartyValuationTechniqueMember_66184f44-1201-451c-8c52-3876462115ff" xlink:href="fnf-20251231.xsd#fnf_ThirdPartyValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_e854d57b-583e-4c7a-97d2-25c8e947ab1b" xlink:to="loc_fnf_ThirdPartyValuationTechniqueMember_66184f44-1201-451c-8c52-3876462115ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_90a2c641-7310-4ea5-a8f3-aff4c36aada2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_e854d57b-583e-4c7a-97d2-25c8e947ab1b" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_90a2c641-7310-4ea5-a8f3-aff4c36aada2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_3055c632-469f-4b8a-a2d9-4078a35c2ff5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_e854d57b-583e-4c7a-97d2-25c8e947ab1b" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_3055c632-469f-4b8a-a2d9-4078a35c2ff5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_BlackScholesModelMember_ee5d3e05-1488-4c66-9a51-ab4fcd03d50e" xlink:href="fnf-20251231.xsd#fnf_BlackScholesModelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_e854d57b-583e-4c7a-97d2-25c8e947ab1b" xlink:to="loc_fnf_BlackScholesModelMember_ee5d3e05-1488-4c66-9a51-ab4fcd03d50e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_7b3580eb-0d69-4de0-9501-dfbad3907a86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_7b3580eb-0d69-4de0-9501-dfbad3907a86" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_7b3580eb-0d69-4de0-9501-dfbad3907a86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_7b3580eb-0d69-4de0-9501-dfbad3907a86" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_7b3580eb-0d69-4de0-9501-dfbad3907a86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_7b3580eb-0d69-4de0-9501-dfbad3907a86" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_43cbe199-20f9-4ded-8e7e-59b7ea41ab21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_43cbe199-20f9-4ded-8e7e-59b7ea41ab21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputEbitdaMultipleMember_57da7b18-e7a0-4cd6-af9e-37396c034089" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputEbitdaMultipleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_us-gaap_MeasurementInputEbitdaMultipleMember_57da7b18-e7a0-4cd6-af9e-37396c034089" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPrepaymentRateMember_0f46abf8-21fd-4fe9-951d-018acc59f540" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_us-gaap_MeasurementInputPrepaymentRateMember_0f46abf8-21fd-4fe9-951d-018acc59f540" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputTypeMarketValueOfFundMember_a8bf6ba2-1bf9-4a0f-9415-c12f895b497b" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputTypeMarketValueOfFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputTypeMarketValueOfFundMember_a8bf6ba2-1bf9-4a0f-9415-c12f895b497b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputMarketValueOfOptionMember_1e69b626-6ffb-4fcc-b3b7-a372cd85c863" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputMarketValueOfOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputMarketValueOfOptionMember_1e69b626-6ffb-4fcc-b3b7-a372cd85c863" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputMortalityMultiplierMember_f53942b7-447c-4168-a66b-8bc954c46dc2" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputMortalityMultiplierMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputMortalityMultiplierMember_f53942b7-447c-4168-a66b-8bc954c46dc2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputSurrenderRatesMember_20490fef-82f9-4b41-b171-b6252cca288e" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputSurrenderRatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputSurrenderRatesMember_20490fef-82f9-4b41-b171-b6252cca288e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputPartialWithdrawalsMember_74dd04ea-f1d8-4dd7-815f-081d7d4359c8" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputPartialWithdrawalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputPartialWithdrawalsMember_74dd04ea-f1d8-4dd7-815f-081d7d4359c8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputNonPerformanceSpreadMember_27952780-3f19-40b8-8db8-b54ecb0d1aa5" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputNonPerformanceSpreadMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputNonPerformanceSpreadMember_27952780-3f19-40b8-8db8-b54ecb0d1aa5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputOptionCostMember_89cf4ba7-78ce-4acf-981e-9a48fe884e9b" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputOptionCostMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputOptionCostMember_89cf4ba7-78ce-4acf-981e-9a48fe884e9b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputRiskAdjustedDiscountRateMember_64210e17-c014-4a87-8ac2-41536e74f574" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputRiskAdjustedDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputRiskAdjustedDiscountRateMember_64210e17-c014-4a87-8ac2-41536e74f574" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputCollateralVolatilityMember_bb7df46a-36b9-46f7-8eda-08068dc3930b" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputCollateralVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputCollateralVolatilityMember_bb7df46a-36b9-46f7-8eda-08068dc3930b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputMortalityRateMember_dc1ab760-16d2-47d8-b968-509856fc16ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputMortalityRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_us-gaap_MeasurementInputMortalityRateMember_dc1ab760-16d2-47d8-b968-509856fc16ff" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputGMWBUtilizationMember_e0112e48-014c-4d9f-a77d-5330e2309ad4" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputGMWBUtilizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputGMWBUtilizationMember_e0112e48-014c-4d9f-a77d-5330e2309ad4" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputEBITAVolatilityMember_acfbc1a4-3c3d-4bae-b69c-f6ccc8d1693c" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputEBITAVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputEBITAVolatilityMember_acfbc1a4-3c3d-4bae-b69c-f6ccc8d1693c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MeasurementInputCounterpartyDiscountRateMember_d5e7dcd1-4a9e-4a8f-8dfd-b157873f7be2" xlink:href="fnf-20251231.xsd#fnf_MeasurementInputCounterpartyDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_fnf_MeasurementInputCounterpartyDiscountRateMember_d5e7dcd1-4a9e-4a8f-8dfd-b157873f7be2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputQuotedPriceMember_2f41c19a-ed49-42df-bd1f-24343b21030b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputQuotedPriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_5dc8039b-d405-4378-a2ce-7729ae681fc4" xlink:to="loc_us-gaap_MeasurementInputQuotedPriceMember_2f41c19a-ed49-42df-bd1f-24343b21030b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_bccbb25c-e3d0-43b8-8549-81aada05bce6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_14067d63-e764-4cd1-a865-b3f35c90286e" xlink:to="loc_srt_RangeAxis_bccbb25c-e3d0-43b8-8549-81aada05bce6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bccbb25c-e3d0-43b8-8549-81aada05bce6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_bccbb25c-e3d0-43b8-8549-81aada05bce6" xlink:to="loc_srt_RangeMember_bccbb25c-e3d0-43b8-8549-81aada05bce6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2e95be95-993b-42e5-b079-674605b21fb1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_bccbb25c-e3d0-43b8-8549-81aada05bce6" xlink:to="loc_srt_RangeMember_2e95be95-993b-42e5-b079-674605b21fb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6b7f315d-e1cc-4c76-8915-cc7cb8dff308" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2e95be95-993b-42e5-b079-674605b21fb1" xlink:to="loc_srt_MinimumMember_6b7f315d-e1cc-4c76-8915-cc7cb8dff308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f2ac6a18-8047-4ad1-818e-a45e5e10965f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2e95be95-993b-42e5-b079-674605b21fb1" xlink:to="loc_srt_MaximumMember_f2ac6a18-8047-4ad1-818e-a45e5e10965f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_c16d72e5-18c5-416c-b98f-5198e66ff8b3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_2e95be95-993b-42e5-b079-674605b21fb1" xlink:to="loc_srt_WeightedAverageMember_c16d72e5-18c5-416c-b98f-5198e66ff8b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_2da3b33c-f5cd-4a9b-8ea5-f885d41106fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_2da3b33c-f5cd-4a9b-8ea5-f885d41106fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_1dd46a6e-4e79-44f4-aeb1-d0c99bad3293" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_1dd46a6e-4e79-44f4-aeb1-d0c99bad3293" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput_960bf694-bc36-4ce3-b488-c9db208a2620" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput_960bf694-bc36-4ce3-b488-c9db208a2620" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EquityMethodInvestmentMeasurementInput_9aae8a81-33e3-4502-b840-c3b086a87c7c" xlink:href="fnf-20251231.xsd#fnf_EquityMethodInvestmentMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_fnf_EquityMethodInvestmentMeasurementInput_9aae8a81-33e3-4502-b840-c3b086a87c7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiMeasurementInput_3d344df8-33b0-408f-a761-9e35ffbfd0f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_EquitySecuritiesFvNiMeasurementInput_3d344df8-33b0-408f-a761-9e35ffbfd0f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetMeasurementInput_827527e1-3351-4e52-9a2a-7b59ba0c1c23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServicingAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_ServicingAssetMeasurementInput_827527e1-3351-4e52-9a2a-7b59ba0c1c23" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeAssetMeasurementInput_a8f13704-bb4e-414a-82d0-d332f0842409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_EmbeddedDerivativeAssetMeasurementInput_a8f13704-bb4e-414a-82d0-d332f0842409" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LoanReceivableMeasurementInput_9c5f1b00-9573-4d0e-9285-9b8a234929e1" xlink:href="fnf-20251231.xsd#fnf_LoanReceivableMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_fnf_LoanReceivableMeasurementInput_9c5f1b00-9573-4d0e-9285-9b8a234929e1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitMeasurementInput_3e27a811-77e4-45ad-ab4a-7e76196d13c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_MarketRiskBenefitMeasurementInput_3e27a811-77e4-45ad-ab4a-7e76196d13c8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_4fbb6ade-cbf5-4f2a-9080-81475a76de86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_4fbb6ade-cbf5-4f2a-9080-81475a76de86" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_aac3df98-70ee-4b0e-841f-7da70663d791" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_cb830f69-da9f-4150-9aae-2e7dd7412e83" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_aac3df98-70ee-4b0e-841f-7da70663d791" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FairValueofFinancialInstrumentsChangestoFairValueofFinancialInstrumentsLevel3Details" xlink:type="simple" xlink:href="fnf-20251231.xsd#FairValueofFinancialInstrumentsChangestoFairValueofFinancialInstrumentsLevel3Details"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FairValueofFinancialInstrumentsChangestoFairValueofFinancialInstrumentsLevel3Details" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ec866b92-dbd6-472a-abd5-5bad7be20611" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4e474109-3f63-40c9-911e-f81db879d0ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ec866b92-dbd6-472a-abd5-5bad7be20611" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4e474109-3f63-40c9-911e-f81db879d0ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_8a081651-8353-4ad9-ab25-1eadbbd9115f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4e474109-3f63-40c9-911e-f81db879d0ae" xlink:to="loc_us-gaap_FinancialInstrumentAxis_8a081651-8353-4ad9-ab25-1eadbbd9115f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8a081651-8353-4ad9-ab25-1eadbbd9115f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_8a081651-8353-4ad9-ab25-1eadbbd9115f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_8a081651-8353-4ad9-ab25-1eadbbd9115f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_8a081651-8353-4ad9-ab25-1eadbbd9115f" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_f5273bfb-7a5a-4eb0-bc7a-97e27d2b35b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_f5273bfb-7a5a-4eb0-bc7a-97e27d2b35b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_52098f74-9f5c-4622-9530-c69bde721d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_52098f74-9f5c-4622-9530-c69bde721d8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_02d9297d-4b42-41df-9c6b-9009a170cc40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_02d9297d-4b42-41df-9c6b-9009a170cc40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_HybridsMember_019c5be4-ba19-7a3c-8950-17ee89740d48" xlink:href="fnf-20251231.xsd#fnf_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_HybridsMember_019c5be4-ba19-7a3c-8950-17ee89740d48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MunicipalsMember_019b2ce2-a87f-7977-bef9-15e8e219fa37" xlink:href="fnf-20251231.xsd#fnf_MunicipalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_MunicipalsMember_019b2ce2-a87f-7977-bef9-15e8e219fa37" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_3530575d-3638-48ee-8d82-7afb0cbb21a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_3530575d-3638-48ee-8d82-7afb0cbb21a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_adfe2393-1ac5-469d-b993-1f6f37b53bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_adfe2393-1ac5-469d-b993-1f6f37b53bfc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_e45e999b-003b-424c-b7b4-61fbb5b4bc3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_PreferredStockMember_e45e999b-003b-424c-b7b4-61fbb5b4bc3d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c7373-c8d1-74ce-9e6b-a2877e99bba9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_CommonStockMember_019c7373-c8d1-74ce-9e6b-a2877e99bba9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c7374-7de9-7acf-b2d5-6cc80b327595" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c7374-7de9-7acf-b2d5-6cc80b327595" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_019c940a-ba31-7af7-b85e-32c97de6106b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_DerivativeMember_019c940a-ba31-7af7-b85e-32c97de6106b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_9352f788-4a09-408d-9773-54dfddddbcea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_InterestRateSwapMember_9352f788-4a09-408d-9773-54dfddddbcea" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_b2e440e6-1880-4411-9624-1ad46bb93fae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_b2e440e6-1880-4411-9624-1ad46bb93fae" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_e3be55c2-e40e-4aea-9873-27532cb16dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_OtherAssetsMember_e3be55c2-e40e-4aea-9873-27532cb16dbf" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_44f5c6fc-29e0-4800-9d50-8d4b0eebc69d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_44f5c6fc-29e0-4800-9d50-8d4b0eebc69d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AvailableForSaleEmbeddedDerivativesMember_f172c0fe-33ab-4907-a59f-42da5e819cfa" xlink:href="fnf-20251231.xsd#fnf_AvailableForSaleEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_AvailableForSaleEmbeddedDerivativesMember_f172c0fe-33ab-4907-a59f-42da5e819cfa" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditLinkedNoteMember_231bc84e-5f19-4cf6-b45d-dfc57ba15029" xlink:href="fnf-20251231.xsd#fnf_CreditLinkedNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_CreditLinkedNoteMember_231bc84e-5f19-4cf6-b45d-dfc57ba15029" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019c5baf-fc49-7a88-a6b3-6828cb11af78" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019c5baf-fc49-7a88-a6b3-6828cb11af78" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LoanReceivableCommitmentAdvancesMember_816fb9ea-c41c-44d5-9093-63ad7ccb9d47" xlink:href="fnf-20251231.xsd#fnf_LoanReceivableCommitmentAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_LoanReceivableCommitmentAdvancesMember_816fb9ea-c41c-44d5-9093-63ad7ccb9d47" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TotalAssetsAtFairValueBeforeMarketRiskBenefitAssetMember_019b2f1d-43aa-789f-8c32-635dc86cb85b" xlink:href="fnf-20251231.xsd#fnf_TotalAssetsAtFairValueBeforeMarketRiskBenefitAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_TotalAssetsAtFairValueBeforeMarketRiskBenefitAssetMember_019b2f1d-43aa-789f-8c32-635dc86cb85b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitAssetMember_a97aedb9-3c17-464b-95b3-e93a6e550a3a" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_MarketRiskBenefitAssetMember_a97aedb9-3c17-464b-95b3-e93a6e550a3a" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TotalLiabilitiesBeforeMarketRiskBenefitMember_465fcdc8-4a04-449f-bc39-13d6e4bb4fa4" xlink:href="fnf-20251231.xsd#fnf_TotalLiabilitiesBeforeMarketRiskBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_TotalLiabilitiesBeforeMarketRiskBenefitMember_465fcdc8-4a04-449f-bc39-13d6e4bb4fa4" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitLiabilityMember_0e4e63a2-9d62-4dfb-8e0f-06ab1da2ecc6" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f2ef3c0a-f36e-4ed5-b98c-f3e0ef8728a7" xlink:to="loc_fnf_MarketRiskBenefitLiabilityMember_0e4e63a2-9d62-4dfb-8e0f-06ab1da2ecc6" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_06750746-c6f5-4d07-912b-57187458c375" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_4e474109-3f63-40c9-911e-f81db879d0ae" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_06750746-c6f5-4d07-912b-57187458c375" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_06750746-c6f5-4d07-912b-57187458c375_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_06750746-c6f5-4d07-912b-57187458c375" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_06750746-c6f5-4d07-912b-57187458c375_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4631ff80-1ded-4c6a-bd29-f51cc0ca1a6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_06750746-c6f5-4d07-912b-57187458c375" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4631ff80-1ded-4c6a-bd29-f51cc0ca1a6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_ca7035f6-bf89-4585-8551-00630fcac58e" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4631ff80-1ded-4c6a-bd29-f51cc0ca1a6f" xlink:to="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_ca7035f6-bf89-4585-8551-00630fcac58e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_c812fd31-f513-406c-8da2-469ed759c446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4631ff80-1ded-4c6a-bd29-f51cc0ca1a6f" xlink:to="loc_us-gaap_InterestRateSwapMember_c812fd31-f513-406c-8da2-469ed759c446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ContingentConsiderationLiabilityMember_4e35fc9e-b961-4143-bde5-4f1a99dcc8d3" xlink:href="fnf-20251231.xsd#fnf_ContingentConsiderationLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4631ff80-1ded-4c6a-bd29-f51cc0ca1a6f" xlink:to="loc_fnf_ContingentConsiderationLiabilityMember_4e35fc9e-b961-4143-bde5-4f1a99dcc8d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8be87a78-d840-4253-8c97-b11be6474c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ec866b92-dbd6-472a-abd5-5bad7be20611" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8be87a78-d840-4253-8c97-b11be6474c0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_6137fac8-9fac-4297-9fde-9847cf1325c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8be87a78-d840-4253-8c97-b11be6474c0f" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_6137fac8-9fac-4297-9fde-9847cf1325c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_6137fac8-9fac-4297-9fde-9847cf1325c2" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_002f588c-3402-400e-aba2-101b00060df0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_002f588c-3402-400e-aba2-101b00060df0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_49b91143-b0c4-4d77-9829-719fe9a10916" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_49b91143-b0c4-4d77-9829-719fe9a10916" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_7585978e-6139-4829-b04b-f1f43e3c2658" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_7585978e-6139-4829-b04b-f1f43e3c2658" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_8829e106-b957-4560-90d7-e1338e41e86e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_8829e106-b957-4560-90d7-e1338e41e86e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_84f0781e-8780-4001-9e1e-22af761ca996" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_84f0781e-8780-4001-9e1e-22af761ca996" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_3eb38f38-5f29-4c53-be0f-dd0b94432607" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_3eb38f38-5f29-4c53-be0f-dd0b94432607" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_54d7a988-b7bb-47b3-948d-f223427359da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_222f6855-9b24-4ae3-a471-0e556672c548" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_54d7a988-b7bb-47b3-948d-f223427359da" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_f98bca0c-c5e8-42d7-9af9-c94aa650c2f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_a8df41b8-b615-4a8a-bdc1-eee57f1d38df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8be87a78-d840-4253-8c97-b11be6474c0f" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_a8df41b8-b615-4a8a-bdc1-eee57f1d38df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8be87a78-d840-4253-8c97-b11be6474c0f" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_62457bbd-66df-45c5-86c3-774940bd5615" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_62457bbd-66df-45c5-86c3-774940bd5615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_ab6255bc-2b88-4452-ae55-501623cb06b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_ab6255bc-2b88-4452-ae55-501623cb06b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_7c29cf9e-e270-41fe-b9cc-622c13786908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_7c29cf9e-e270-41fe-b9cc-622c13786908" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_9159ee55-4f8c-423c-82e1-7c5702563012" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_9159ee55-4f8c-423c-82e1-7c5702563012" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_46513fae-70b6-4eba-b931-0dc7898619ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_46513fae-70b6-4eba-b931-0dc7898619ce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_2bee9956-28e8-4a41-97b0-2494528bd6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_2bee9956-28e8-4a41-97b0-2494528bd6d4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_a776b878-c2c1-4ecc-ac74-f3a93225463d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_f4cd0a23-f417-478b-b845-2f1067bfe349" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_a776b878-c2c1-4ecc-ac74-f3a93225463d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_f9ca6d7c-f51d-475d-b6a0-66db5cd0246e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_c8fd601c-2b9d-4845-b332-73bd3d43e8d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_8be87a78-d840-4253-8c97-b11be6474c0f" xlink:to="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_c8fd601c-2b9d-4845-b332-73bd3d43e8d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList_d61bbd14-e8ab-41ca-960c-def93a6b963e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ec866b92-dbd6-472a-abd5-5bad7be20611" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList_d61bbd14-e8ab-41ca-960c-def93a6b963e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList_9d6541bd-50c1-407d-acd3-f86e81fef011" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ec866b92-dbd6-472a-abd5-5bad7be20611" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfOtherComprehensiveIncomeExtensibleList_9d6541bd-50c1-407d-acd3-f86e81fef011" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FairValueofFinancialInstrumentsFairValueOptionDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FairValueofFinancialInstrumentsFairValueOptionDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FairValueofFinancialInstrumentsFairValueOptionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c5bef-9dc2-7158-a611-5c4058c94052" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c5bef-9dc2-7158-a611-5c4058c94052" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c5bef-9dc2-7da1-8643-a2e5d3b5abfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c5bef-9dc2-7158-a611-5c4058c94052" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c5bef-9dc2-7da1-8643-a2e5d3b5abfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c5bef-9dc2-7da1-8643-a2e5d3b5abfc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c5bef-9dc2-7da1-8643-a2e5d3b5abfc" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c5bef-9dc2-7da1-8643-a2e5d3b5abfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c5bef-9dc2-721e-af33-49be20816541" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c5bef-9dc2-7da1-8643-a2e5d3b5abfc" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c5bef-9dc2-721e-af33-49be20816541" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c5bef-9dc2-711f-8c96-56ce92df0414" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c5bef-9dc2-721e-af33-49be20816541" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c5bef-9dc2-711f-8c96-56ce92df0414" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019c5bef-9dc2-711a-a82a-c034cea8a481" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_019c5bef-9dc2-7158-a611-5c4058c94052" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019c5bef-9dc2-711a-a82a-c034cea8a481" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c5bef-9dc2-711a-a82a-c034cea8a481_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c5bef-9dc2-711a-a82a-c034cea8a481" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c5bef-9dc2-711a-a82a-c034cea8a481_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c5bef-9dc2-7b53-9da2-ac200b18a841" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019c5bef-9dc2-711a-a82a-c034cea8a481" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c5bef-9dc2-7b53-9da2-ac200b18a841" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_UnconsolidatedInvestmentsMember_019c5bef-9dc2-7b82-8885-78c472fd1f08" xlink:href="fnf-20251231.xsd#fnf_UnconsolidatedInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c5bef-9dc2-7b53-9da2-ac200b18a841" xlink:to="loc_fnf_UnconsolidatedInvestmentsMember_019c5bef-9dc2-7b82-8885-78c472fd1f08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionOtherEligibleItemsMember_019c6791-d2be-7eb0-b786-d73177d91d76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOptionOtherEligibleItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019c5bef-9dc2-7b53-9da2-ac200b18a841" xlink:to="loc_us-gaap_FairValueOptionOtherEligibleItemsMember_019c6791-d2be-7eb0-b786-d73177d91d76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019c5bef-9dc2-700a-8d15-749813b32449" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019c5bef-9dc2-700a-8d15-749813b32449" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherLoansWithinOtherLongTermInvestmentsFairValue_019c5bef-9dc2-7a6a-82ce-24b41db1e179" xlink:href="fnf-20251231.xsd#fnf_OtherLoansWithinOtherLongTermInvestmentsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_fnf_OtherLoansWithinOtherLongTermInvestmentsFairValue_019c5bef-9dc2-7a6a-82ce-24b41db1e179" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherLoansWithinOtherLongTermInvestmentsAggregateUnpaidPrincipal_019c5bef-9dc2-7e39-a423-10af0363920b" xlink:href="fnf-20251231.xsd#fnf_OtherLoansWithinOtherLongTermInvestmentsAggregateUnpaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_fnf_OtherLoansWithinOtherLongTermInvestmentsAggregateUnpaidPrincipal_019c5bef-9dc2-7e39-a423-10af0363920b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LoanReceivableWithinPrepaidExpensesAndOtherAssetsFairValue_019c5bef-9dc2-70f3-9c96-8e0c00fa47f9" xlink:href="fnf-20251231.xsd#fnf_LoanReceivableWithinPrepaidExpensesAndOtherAssetsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_fnf_LoanReceivableWithinPrepaidExpensesAndOtherAssetsFairValue_019c5bef-9dc2-70f3-9c96-8e0c00fa47f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LoanReceivableWithinPrepaidExpensesAndOtherAssetsAggregateUnpaidPrincipal_019c5bef-9dc2-7355-816f-e4b8c747a7e5" xlink:href="fnf-20251231.xsd#fnf_LoanReceivableWithinPrepaidExpensesAndOtherAssetsAggregateUnpaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_fnf_LoanReceivableWithinPrepaidExpensesAndOtherAssetsAggregateUnpaidPrincipal_019c5bef-9dc2-7355-816f-e4b8c747a7e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019c5bef-dffe-7fbd-aec2-b53fe63e9573" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_019c5bef-9dc2-7ee7-ae4e-7431b5fb9c98" xlink:to="loc_us-gaap_EquityMethodInvestments_019c5bef-dffe-7fbd-aec2-b53fe63e9573" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FairValueofFinancialInstrumentsCarryingValueandEstimatedFairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FairValueofFinancialInstrumentsCarryingValueandEstimatedFairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FairValueofFinancialInstrumentsCarryingValueandEstimatedFairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7241784e-7a28-4bd0-9a7d-1e21e1c5e1c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2eeca5b8-d0ef-4185-8126-1845479cfe61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7241784e-7a28-4bd0-9a7d-1e21e1c5e1c4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2eeca5b8-d0ef-4185-8126-1845479cfe61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6bc7c3f4-f50b-441c-8173-1c39fdce97bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2eeca5b8-d0ef-4185-8126-1845479cfe61" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6bc7c3f4-f50b-441c-8173-1c39fdce97bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6bc7c3f4-f50b-441c-8173-1c39fdce97bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6bc7c3f4-f50b-441c-8173-1c39fdce97bd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6bc7c3f4-f50b-441c-8173-1c39fdce97bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8fc282c6-3a9b-430a-92f3-aa8196407408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6bc7c3f4-f50b-441c-8173-1c39fdce97bd" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8fc282c6-3a9b-430a-92f3-aa8196407408" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_433254b5-5a09-4339-a5e7-3b9765a8b9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8fc282c6-3a9b-430a-92f3-aa8196407408" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_433254b5-5a09-4339-a5e7-3b9765a8b9f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_162e6077-bff9-48c7-8c89-3cf976bce9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8fc282c6-3a9b-430a-92f3-aa8196407408" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_162e6077-bff9-48c7-8c89-3cf976bce9e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_25e4338b-5531-4ab1-b791-71709724d73e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8fc282c6-3a9b-430a-92f3-aa8196407408" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_25e4338b-5531-4ab1-b791-71709724d73e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_1d370266-3209-41a4-9de5-cdfb4814d848" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8fc282c6-3a9b-430a-92f3-aa8196407408" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_1d370266-3209-41a4-9de5-cdfb4814d848" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_26058ab2-09c4-4cc7-adf8-024ba3f8c918" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_2eeca5b8-d0ef-4185-8126-1845479cfe61" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_26058ab2-09c4-4cc7-adf8-024ba3f8c918" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_26058ab2-09c4-4cc7-adf8-024ba3f8c918_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_26058ab2-09c4-4cc7-adf8-024ba3f8c918" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_26058ab2-09c4-4cc7-adf8-024ba3f8c918_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_e3c0b208-0ee3-4f58-a6eb-59e29049529d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_26058ab2-09c4-4cc7-adf8-024ba3f8c918" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_e3c0b208-0ee3-4f58-a6eb-59e29049529d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b996febb-408d-4f9d-84b8-c5daddb57b36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_e3c0b208-0ee3-4f58-a6eb-59e29049529d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b996febb-408d-4f9d-84b8-c5daddb57b36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_0f0f5508-ca95-4726-940e-2f49ebb94e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b996febb-408d-4f9d-84b8-c5daddb57b36" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_0f0f5508-ca95-4726-940e-2f49ebb94e1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_d8632ea0-7fdc-4f99-bcf8-0d045a8dc0cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_b996febb-408d-4f9d-84b8-c5daddb57b36" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_d8632ea0-7fdc-4f99-bcf8-0d045a8dc0cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7241784e-7a28-4bd0-9a7d-1e21e1c5e1c4" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FHLBCommonStockFairValue_cc2ae7fc-0fa9-4166-b8fb-478da645fe09" xlink:href="fnf-20251231.xsd#fnf_FHLBCommonStockFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_fnf_FHLBCommonStockFairValue_cc2ae7fc-0fa9-4166-b8fb-478da645fe09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestmentsCommercialMortgageLoansFairValueDisclosure_31094ce0-fd06-4102-a316-7d20caf6994a" xlink:href="fnf-20251231.xsd#fnf_InvestmentsCommercialMortgageLoansFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_fnf_InvestmentsCommercialMortgageLoansFairValueDisclosure_31094ce0-fd06-4102-a316-7d20caf6994a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestmentsResidentialMortgageLoansFairValueDisclosure_f4ef890c-d44c-44e6-9ccc-6c03cb088ce3" xlink:href="fnf-20251231.xsd#fnf_InvestmentsResidentialMortgageLoansFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_fnf_InvestmentsResidentialMortgageLoansFairValueDisclosure_f4ef890c-d44c-44e6-9ccc-6c03cb088ce3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_58d8bf2f-27ec-45ab-b6bc-7518d376f1e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_us-gaap_EquityMethodInvestments_58d8bf2f-27ec-45ab-b6bc-7518d376f1e8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyLoansFairValue_2c773f42-8d2e-4492-961c-057d4e685bed" xlink:href="fnf-20251231.xsd#fnf_PolicyLoansFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_fnf_PolicyLoansFairValue_2c773f42-8d2e-4492-961c-057d4e685bed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestmentsAffiliatedBankLoanFairValueDisclosure_34d87755-3014-4355-a309-09f9b3ccd005" xlink:href="fnf-20251231.xsd#fnf_InvestmentsAffiliatedBankLoanFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_fnf_InvestmentsAffiliatedBankLoanFairValueDisclosure_34d87755-3014-4355-a309-09f9b3ccd005" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_b9198444-d1d5-4f10-be05-30b1f9022556" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankOwnedLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_b9198444-d1d5-4f10-be05-30b1f9022556" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_ed1325c0-f428-4aa1-a4d7-344604bc6134" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndNotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_ed1325c0-f428-4aa1-a4d7-344604bc6134" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AssetscarriedonBalanceSheetatamountsotherthanfairvalue_dc294697-b172-4ea7-b42f-aeda04da499b" xlink:href="fnf-20251231.xsd#fnf_AssetscarriedonBalanceSheetatamountsotherthanfairvalue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_1ceda65c-ecc8-41eb-ba5b-53a6f306818b" xlink:to="loc_fnf_AssetscarriedonBalanceSheetatamountsotherthanfairvalue_dc294697-b172-4ea7-b42f-aeda04da499b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_34b19aba-0dd1-4f32-ae68-ecc3176a6e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7241784e-7a28-4bd0-9a7d-1e21e1c5e1c4" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_34b19aba-0dd1-4f32-ae68-ecc3176a6e4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LiabilitiesRelatedToInvestmentContractsOtherThanFairValueDisclosure_019b2f7e-475f-7afe-af8f-815be6c55746" xlink:href="fnf-20251231.xsd#fnf_LiabilitiesRelatedToInvestmentContractsOtherThanFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_34b19aba-0dd1-4f32-ae68-ecc3176a6e4f" xlink:to="loc_fnf_LiabilitiesRelatedToInvestmentContractsOtherThanFairValueDisclosure_019b2f7e-475f-7afe-af8f-815be6c55746" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_fb49596e-3c72-4649-89a9-73e9e2bfc744" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_34b19aba-0dd1-4f32-ae68-ecc3176a6e4f" xlink:to="loc_us-gaap_DebtInstrumentFairValue_fb49596e-3c72-4649-89a9-73e9e2bfc744" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LiabilitiescarriedonBalanceSheetatamountsotherthanfairvalue_06c4c671-3186-4ebf-a78b-16bb787fd66c" xlink:href="fnf-20251231.xsd#fnf_LiabilitiescarriedonBalanceSheetatamountsotherthanfairvalue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_34b19aba-0dd1-4f32-ae68-ecc3176a6e4f" xlink:to="loc_fnf_LiabilitiescarriedonBalanceSheetatamountsotherthanfairvalue_06c4c671-3186-4ebf-a78b-16bb787fd66c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsConsolidatedInvestmentsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsConsolidatedInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsConsolidatedInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_9ee0c3b2-22d0-421d-b316-4bd2a2e52710" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_3dda8bf2-56be-4fdf-bc1d-4e9ab63283bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_9ee0c3b2-22d0-421d-b316-4bd2a2e52710" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_3dda8bf2-56be-4fdf-bc1d-4e9ab63283bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_7a4a9654-089e-4a8a-96e2-a9699b32ac10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_3dda8bf2-56be-4fdf-bc1d-4e9ab63283bd" xlink:to="loc_us-gaap_FinancialInstrumentAxis_7a4a9654-089e-4a8a-96e2-a9699b32ac10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_7a4a9654-089e-4a8a-96e2-a9699b32ac10_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_7a4a9654-089e-4a8a-96e2-a9699b32ac10" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_7a4a9654-089e-4a8a-96e2-a9699b32ac10_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_7a4a9654-089e-4a8a-96e2-a9699b32ac10" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_3b817b00-d891-418a-93c3-39c7f40970b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_3b817b00-d891-418a-93c3-39c7f40970b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_e37fd47f-6bfc-45ac-a522-6aa0a26ddd93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_e37fd47f-6bfc-45ac-a522-6aa0a26ddd93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_939a8cb4-7e20-4e15-a0f6-a9f91b21000a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_939a8cb4-7e20-4e15-a0f6-a9f91b21000a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_HybridsMember_72899474-3e57-45ae-aebc-adf19a60ab7a" xlink:href="fnf-20251231.xsd#fnf_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_fnf_HybridsMember_72899474-3e57-45ae-aebc-adf19a60ab7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MunicipalsMember_954055cd-8cb5-45d1-b21e-9c41e7585e59" xlink:href="fnf-20251231.xsd#fnf_MunicipalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_fnf_MunicipalsMember_954055cd-8cb5-45d1-b21e-9c41e7585e59" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_22e034f5-8fb9-4faf-9b23-08c56df88abe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_22e034f5-8fb9-4faf-9b23-08c56df88abe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_60fa6c89-de9b-4757-bff3-6fff969708ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_60fa6c89-de9b-4757-bff3-6fff969708ed" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_ff96bcae-a0a5-496d-87d7-e42fd040dfc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_ee2a2d81-c9f5-4e41-b9d4-b308094a094b" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_ff96bcae-a0a5-496d-87d7-e42fd040dfc8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_9ee0c3b2-22d0-421d-b316-4bd2a2e52710" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_588003ea-4a5b-4379-81db-86775f1794ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_588003ea-4a5b-4379-81db-86775f1794ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_6aa7e1c0-4362-42a6-abea-c179b3f7e87c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_6aa7e1c0-4362-42a6-abea-c179b3f7e87c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_4efdb691-22ce-4ebe-9ca5-58b7a4fd7836" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_4efdb691-22ce-4ebe-9ca5-58b7a4fd7836" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_2ae02f1b-89e0-4975-8210-85e83cbbf251" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_2ae02f1b-89e0-4975-8210-85e83cbbf251" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_9e13b962-2e29-4220-937f-2c3d373be2a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_c498190c-9159-41c4-8556-0a243f60baef" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_9e13b962-2e29-4220-937f-2c3d373be2a0" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_d125dbc9-0c5e-432d-bd8c-b6ed592d2d69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_us-gaap_FinancialInstrumentAxis_d125dbc9-0c5e-432d-bd8c-b6ed592d2d69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d125dbc9-0c5e-432d-bd8c-b6ed592d2d69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_d125dbc9-0c5e-432d-bd8c-b6ed592d2d69" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d125dbc9-0c5e-432d-bd8c-b6ed592d2d69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e1c1ad60-3b5e-48b9-b943-20edf9fc356a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_d125dbc9-0c5e-432d-bd8c-b6ed592d2d69" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e1c1ad60-3b5e-48b9-b943-20edf9fc356a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_a786c26b-a542-464f-9dca-0ce55c678983" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e1c1ad60-3b5e-48b9-b943-20edf9fc356a" xlink:to="loc_us-gaap_DebtSecuritiesMember_a786c26b-a542-464f-9dca-0ce55c678983" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_9f65e8c3-91c3-44c1-86f4-8423a436b4af" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_9f65e8c3-91c3-44c1-86f4-8423a436b4af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_9f65e8c3-91c3-44c1-86f4-8423a436b4af_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_9f65e8c3-91c3-44c1-86f4-8423a436b4af" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_9f65e8c3-91c3-44c1-86f4-8423a436b4af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5200b245-a3cb-49ee-9a45-b5167f6482cb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_9f65e8c3-91c3-44c1-86f4-8423a436b4af" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5200b245-a3cb-49ee-9a45-b5167f6482cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MortgageLoansMember_16c30e70-4d46-4894-aebd-ee128ad65de7" xlink:href="fnf-20251231.xsd#fnf_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_5200b245-a3cb-49ee-9a45-b5167f6482cb" xlink:to="loc_fnf_MortgageLoansMember_16c30e70-4d46-4894-aebd-ee128ad65de7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a64ef067-7399-4df2-80ec-354397f2ad30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a64ef067-7399-4df2-80ec-354397f2ad30" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_a64ef067-7399-4df2-80ec-354397f2ad30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a64ef067-7399-4df2-80ec-354397f2ad30" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_a64ef067-7399-4df2-80ec-354397f2ad30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_79bcea3c-8c2a-488f-9ad5-985c81c7416d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_a64ef067-7399-4df2-80ec-354397f2ad30" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_79bcea3c-8c2a-488f-9ad5-985c81c7416d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_071805d9-50e4-4250-9169-c366de4a0c7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_79bcea3c-8c2a-488f-9ad5-985c81c7416d" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_071805d9-50e4-4250-9169-c366de4a0c7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_ffd2471d-c930-4b57-b935-eef24e29983b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_79bcea3c-8c2a-488f-9ad5-985c81c7416d" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_ffd2471d-c930-4b57-b935-eef24e29983b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_45f1e668-9c06-44f2-be7b-ccc5167f1952" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_srt_StatementGeographicalAxis_45f1e668-9c06-44f2-be7b-ccc5167f1952" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_45f1e668-9c06-44f2-be7b-ccc5167f1952_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_45f1e668-9c06-44f2-be7b-ccc5167f1952" xlink:to="loc_srt_SegmentGeographicalDomain_45f1e668-9c06-44f2-be7b-ccc5167f1952_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_0e03622c-e972-4d39-a528-7ec5497a7284" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_45f1e668-9c06-44f2-be7b-ccc5167f1952" xlink:to="loc_srt_SegmentGeographicalDomain_0e03622c-e972-4d39-a528-7ec5497a7284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_2832da7e-da78-41fb-a7e3-47ca5a3354ad" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_0e03622c-e972-4d39-a528-7ec5497a7284" xlink:to="loc_country_US_2832da7e-da78-41fb-a7e3-47ca5a3354ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_5bcf9e86-309a-4c47-b302-cbee5a5f89e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_us-gaap_InvestmentTypeAxis_5bcf9e86-309a-4c47-b302-cbee5a5f89e9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_5bcf9e86-309a-4c47-b302-cbee5a5f89e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_5bcf9e86-309a-4c47-b302-cbee5a5f89e9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_5bcf9e86-309a-4c47-b302-cbee5a5f89e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_bc0bd975-117a-427d-8617-8176e4c6cf02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_5bcf9e86-309a-4c47-b302-cbee5a5f89e9" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_bc0bd975-117a-427d-8617-8176e4c6cf02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundsWithheldReinsuranceAgreementsMember_c3b3815a-244e-4855-8d6d-554de75ca51b" xlink:href="fnf-20251231.xsd#fnf_FundsWithheldReinsuranceAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_bc0bd975-117a-427d-8617-8176e4c6cf02" xlink:to="loc_fnf_FundsWithheldReinsuranceAgreementsMember_c3b3815a-244e-4855-8d6d-554de75ca51b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c737b-47e6-7702-bb19-e904cf7806e0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c737b-47e6-7702-bb19-e904cf7806e0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c737b-47e6-7702-bb19-e904cf7806e0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c737b-47e6-7702-bb19-e904cf7806e0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c737b-47e6-7702-bb19-e904cf7806e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c737b-47e6-7e40-9efd-d514a56955ab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c737b-47e6-7702-bb19-e904cf7806e0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c737b-47e6-7e40-9efd-d514a56955ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c737b-47e6-7566-865e-85afe281dc2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c737b-47e6-7e40-9efd-d514a56955ab" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c737b-47e6-7566-865e-85afe281dc2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019c9509-b6b4-74f7-9f7a-41e79569e64c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_6c31328c-886f-4ec3-86b8-88219a95a890" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019c9509-b6b4-74f7-9f7a-41e79569e64c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019c9509-b6b4-74f7-9f7a-41e79569e64c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019c9509-b6b4-74f7-9f7a-41e79569e64c" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019c9509-b6b4-74f7-9f7a-41e79569e64c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019c9509-b6b4-7110-b46b-799623879172" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019c9509-b6b4-74f7-9f7a-41e79569e64c" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019c9509-b6b4-7110-b46b-799623879172" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019c9509-f780-798b-bad6-88bb91e3cba2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019c9509-b6b4-7110-b46b-799623879172" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019c9509-f780-798b-bad6-88bb91e3cba2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldByInsuranceRegulators_d343f398-b176-4c78-93af-83e33ecc9b81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsHeldByInsuranceRegulators"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_AssetsHeldByInsuranceRegulators_d343f398-b176-4c78-93af-83e33ecc9b81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestmentNonIncomeProducingGreaterThanTwelveMonthsFairValueDisclosure_2e9b11fc-de6c-4406-92f2-a955bec99dab" xlink:href="fnf-20251231.xsd#fnf_InvestmentNonIncomeProducingGreaterThanTwelveMonthsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_InvestmentNonIncomeProducingGreaterThanTwelveMonthsFairValueDisclosure_2e9b11fc-de6c-4406-92f2-a955bec99dab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_1beef6e0-a468-4b25-aed2-860492ebfac9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_1beef6e0-a468-4b25-aed2-860492ebfac9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList_ed6ae963-2538-4165-9af1-5f694f73da5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList_ed6ae963-2538-4165-9af1-5f694f73da5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1_d557d309-ac10-48ac-8798-8d147dd82162" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1_d557d309-ac10-48ac-8798-8d147dd82162" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_9eddd9d5-df5a-47d8-af7d-8f478b726ea1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_9eddd9d5-df5a-47d8-af7d-8f478b726ea1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAllowanceForCreditLossExcludingAccruedInterest_6274713a-f686-42d3-a076-6082fedf4467" xlink:href="fnf-20251231.xsd#fnf_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAllowanceForCreditLossExcludingAccruedInterest_6274713a-f686-42d3-a076-6082fedf4467" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CommercialMortgageLoansPercentageOfInvestments_70e9c926-8d3b-48d6-a615-af8049a1f19e" xlink:href="fnf-20251231.xsd#fnf_CommercialMortgageLoansPercentageOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_CommercialMortgageLoansPercentageOfInvestments_70e9c926-8d3b-48d6-a615-af8049a1f19e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioAmortizationPeriod_36b152f6-f077-4206-a3f8-6168b76f398b" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_DebtServiceCoverageRatioAmortizationPeriod_36b152f6-f077-4206-a3f8-6168b76f398b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NumberOfMortgageLoansDelinquentInPrincipalOrInterest_d31b0747-c81f-44c0-be59-5062bafcd0ab" xlink:href="fnf-20251231.xsd#fnf_NumberOfMortgageLoansDelinquentInPrincipalOrInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_NumberOfMortgageLoansDelinquentInPrincipalOrInterest_d31b0747-c81f-44c0-be59-5062bafcd0ab" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ResidentialMortgageReceivablePercentageofTotal_9493cc3d-21d0-4ad0-aa36-1303cbdb84f5" xlink:href="fnf-20251231.xsd#fnf_ResidentialMortgageReceivablePercentageofTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_ResidentialMortgageReceivablePercentageofTotal_9493cc3d-21d0-4ad0-aa36-1303cbdb84f5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ResidentialMortgageLoansLocationPercentage_f1fcfaf5-439a-416a-9cce-638e7fdd7142" xlink:href="fnf-20251231.xsd#fnf_ResidentialMortgageLoansLocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_ResidentialMortgageLoansLocationPercentage_f1fcfaf5-439a-416a-9cce-638e7fdd7142" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery_80bc18e3-eb97-4cf8-ae86-00995ce3d0ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery_80bc18e3-eb97-4cf8-ae86-00995ce3d0ea" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_1b008aa9-87b9-4a23-854f-881ba3f6e728" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_1b008aa9-87b9-4a23-854f-881ba3f6e728" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansInProcessOfForeclosureAmount_52f93161-0fb8-4390-9149-f22c640a6f1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageLoansInProcessOfForeclosureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_MortgageLoansInProcessOfForeclosureAmount_52f93161-0fb8-4390-9149-f22c640a6f1f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableAllowanceForCreditLossProbabilityOfLossDefaultModelUsingReasonableAndSupportableProjectedLossForecastPeriod_698e60dc-dbe7-4983-81f9-75e21f5fe170" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableAllowanceForCreditLossProbabilityOfLossDefaultModelUsingReasonableAndSupportableProjectedLossForecastPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_FinancingReceivableAllowanceForCreditLossProbabilityOfLossDefaultModelUsingReasonableAndSupportableProjectedLossForecastPeriod_698e60dc-dbe7-4983-81f9-75e21f5fe170" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableAllowanceForCreditLossProbabilityOfProjectedLossDefaultProjectionModelUsingMarketHistoricalLossPeriod_3ba6c23a-92ad-471e-ad13-f9d32868344f" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableAllowanceForCreditLossProbabilityOfProjectedLossDefaultProjectionModelUsingMarketHistoricalLossPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_FinancingReceivableAllowanceForCreditLossProbabilityOfProjectedLossDefaultProjectionModelUsingMarketHistoricalLossPeriod_3ba6c23a-92ad-471e-ad13-f9d32868344f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_7fa24c56-a53d-4a9c-bc4d-da25e0f6f559" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_7fa24c56-a53d-4a9c-bc4d-da25e0f6f559" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_9b320665-7fd6-4dac-bf02-5595a20b155c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_9b320665-7fd6-4dac-bf02-5595a20b155c" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_d64680e6-b9c5-4d93-86fb-0dd9e802ab5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_d64680e6-b9c5-4d93-86fb-0dd9e802ab5e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ReinsuranceAgreementRecognizedGainsLosses_4a817807-cd4e-49e9-a3e5-a40cfd560178" xlink:href="fnf-20251231.xsd#fnf_ReinsuranceAgreementRecognizedGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_fnf_ReinsuranceAgreementRecognizedGainsLosses_4a817807-cd4e-49e9-a3e5-a40cfd560178" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019c737b-47e6-79f8-9cc1-128072d82b20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_34e44d3d-9846-49a0-bcd1-9feb9c6c7635" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019c737b-47e6-79f8-9cc1-128072d82b20" xlink:type="arc" order="21"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsAmortizedCostandFairValueofFixedMaturityAvailableforSaleSecuritiesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsAmortizedCostandFairValueofFixedMaturityAvailableforSaleSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsAmortizedCostandFairValueofFixedMaturityAvailableforSaleSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019b2ed5-d6ee-7aa6-b353-6e6791c012cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019b2ed5-d6ee-71a1-a401-9a29d1814c12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019b2ed5-d6ee-7aa6-b353-6e6791c012cf" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019b2ed5-d6ee-71a1-a401-9a29d1814c12" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019b2ed5-d6ee-729e-b197-f263bf8d3927" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019b2ed5-d6ee-71a1-a401-9a29d1814c12" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019b2ed5-d6ee-729e-b197-f263bf8d3927" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-729e-b197-f263bf8d3927_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019b2ed5-d6ee-729e-b197-f263bf8d3927" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-729e-b197-f263bf8d3927_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-7acc-8ee5-329aef858e67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019b2ed5-d6ee-729e-b197-f263bf8d3927" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-7acc-8ee5-329aef858e67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CorporatesNonStructuredHybridsMunicipalAndGovernmentSecuritiesMember_019b2ed5-d6ee-7b36-a123-8e7c9c889cfe" xlink:href="fnf-20251231.xsd#fnf_CorporatesNonStructuredHybridsMunicipalAndGovernmentSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-7acc-8ee5-329aef858e67" xlink:to="loc_fnf_CorporatesNonStructuredHybridsMunicipalAndGovernmentSecuritiesMember_019b2ed5-d6ee-7b36-a123-8e7c9c889cfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019b2ed5-d6ee-7632-be2f-1ddf072f0c5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-7acc-8ee5-329aef858e67" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019b2ed5-d6ee-7632-be2f-1ddf072f0c5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019b2ed5-d6ee-7d75-a765-8dee5c2ed62c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-7acc-8ee5-329aef858e67" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019b2ed5-d6ee-7d75-a765-8dee5c2ed62c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019b2ed5-d6ee-7d0f-87a4-52d7b9cbf8e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019b2ed5-d6ee-7acc-8ee5-329aef858e67" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019b2ed5-d6ee-7d0f-87a4-52d7b9cbf8e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019b2ed5-d6ee-7aa6-b353-6e6791c012cf" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019b2ed5-d6ee-757c-bd0e-9a634d5884e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019b2ed5-d6ee-757c-bd0e-9a634d5884e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019b2ed5-d6ee-7b71-84c1-e7a4160d03ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019b2ed5-d6ee-7b71-84c1-e7a4160d03ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019b2ed5-d6ee-7464-a348-dac8e09b6dcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019b2ed5-d6ee-7464-a348-dac8e09b6dcd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019b2ed5-d6ee-783f-b70c-b2f0383ecb37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019b2ed5-d6ee-783f-b70c-b2f0383ecb37" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019b2ed5-d6ee-71d9-8f4c-8baa1e01959f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019b2ed5-d6ee-71d9-8f4c-8baa1e01959f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019b2ed5-d6ee-7607-b418-cbb3b6984300" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019b2ed5-d6ee-7607-b418-cbb3b6984300" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019b2ed5-d6ee-7597-a927-c8f2f0164cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract_019b2ed5-d6ee-7aff-8012-dac4d8ae6c3e" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019b2ed5-d6ee-7597-a927-c8f2f0164cd9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019b2ed5-d6ee-7aa6-b353-6e6791c012cf" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019b2ed5-d6ee-7100-903d-f1d929b54ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019b2ed5-d6ee-7100-903d-f1d929b54ea0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019b2ed5-d6ee-7005-8f90-f6203af881f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019b2ed5-d6ee-7005-8f90-f6203af881f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019b2ed5-d6ee-7e21-b932-56206ca7a738" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019b2ed5-d6ee-7e21-b932-56206ca7a738" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019b2ed5-d6ee-7b7d-bf19-be0d0d627efa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019b2ed5-d6ee-7b7d-bf19-be0d0d627efa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019b2ed5-d6ee-7e58-9b3b-bf0d745d7ed5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019b2ed5-d6ee-7e58-9b3b-bf0d745d7ed5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019b2ed5-d6ee-70bd-9f63-3c0c8520cc26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019b2ed5-d6ee-70bd-9f63-3c0c8520cc26" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019b2ed5-d6ee-78c3-98d0-a44a10f66c79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAbstract_019b2ed5-d6ee-73e6-a2f9-ed7c8643a97b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019b2ed5-d6ee-78c3-98d0-a44a10f66c79" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsFairValueandGrossUnrealizedLossesofAvailableforSaleSecuritiesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsFairValueandGrossUnrealizedLossesofAvailableforSaleSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsFairValueandGrossUnrealizedLossesofAvailableforSaleSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_873d9864-630c-49b4-a126-647d9929a788" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_873d9864-630c-49b4-a126-647d9929a788" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_fa52cc2d-70f2-4f11-be88-e33e012c987d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_873d9864-630c-49b4-a126-647d9929a788" xlink:to="loc_us-gaap_FinancialInstrumentAxis_fa52cc2d-70f2-4f11-be88-e33e012c987d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fa52cc2d-70f2-4f11-be88-e33e012c987d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_fa52cc2d-70f2-4f11-be88-e33e012c987d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fa52cc2d-70f2-4f11-be88-e33e012c987d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_fa52cc2d-70f2-4f11-be88-e33e012c987d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_75be8415-10d3-4290-821b-4f8ff1a22cba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_75be8415-10d3-4290-821b-4f8ff1a22cba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_1d528249-19b9-447b-87df-57f527fa019b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_1d528249-19b9-447b-87df-57f527fa019b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_5fee7334-8fbc-4f82-bf5c-148cd296e3d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_5fee7334-8fbc-4f82-bf5c-148cd296e3d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_HybridsMember_5ccf5864-e23e-407e-b605-54e3773c140f" xlink:href="fnf-20251231.xsd#fnf_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_fnf_HybridsMember_5ccf5864-e23e-407e-b605-54e3773c140f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MunicipalsMember_019b2ebf-d2d0-7261-8e3a-ef30b2c24f86" xlink:href="fnf-20251231.xsd#fnf_MunicipalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_fnf_MunicipalsMember_019b2ebf-d2d0-7261-8e3a-ef30b2c24f86" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019b2ec0-2b18-70f5-9958-b02ae931d6cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019b2ec0-2b18-70f5-9958-b02ae931d6cc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_71eb0e86-9cbb-4c40-899e-f909d4b6bc5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_71eb0e86-9cbb-4c40-899e-f909d4b6bc5c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_6944da35-ff50-4b47-91e5-7f6a3dd2e70e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1a662e32-eaa9-4f28-9317-85bbc4a1701e" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_6944da35-ff50-4b47-91e5-7f6a3dd2e70e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_4920f000-b3c3-46ed-840d-e11c3a0b34ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_4920f000-b3c3-46ed-840d-e11c3a0b34ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_7d1e572f-aaf1-4129-a0ea-821029df281d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_7d1e572f-aaf1-4129-a0ea-821029df281d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_e8b5929d-02ef-4bb7-b95d-952ee092713a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_e8b5929d-02ef-4bb7-b95d-952ee092713a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_efcdf030-6449-43ce-b18a-1bd578452446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_efcdf030-6449-43ce-b18a-1bd578452446" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_76daf787-e6a4-410a-87e6-c39b9c1b1214" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_76daf787-e6a4-410a-87e6-c39b9c1b1214" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_814868a8-3291-41d1-90f5-855154d5f4ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_814868a8-3291-41d1-90f5-855154d5f4ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_eadc6310-58fb-44aa-adab-2ac3b8430925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_eadc6310-58fb-44aa-adab-2ac3b8430925" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_abec2191-6b5e-4755-b293-84510ed24845" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_abec2191-6b5e-4755-b293-84510ed24845" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_9bf74c00-206d-428d-be33-932277c49cb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_a12868e3-c5c7-4d99-8d5c-f23763522f51" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_9bf74c00-206d-428d-be33-932277c49cb4" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsCommercialMortgageLoanGrossofValuationAllowanceByPropertyTypeandRegionDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsCommercialMortgageLoanGrossofValuationAllowanceByPropertyTypeandRegionDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsCommercialMortgageLoanGrossofValuationAllowanceByPropertyTypeandRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_b958a42f-be2f-458a-a676-e6bad9fb60b3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_b958a42f-be2f-458a-a676-e6bad9fb60b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_b958a42f-be2f-458a-a676-e6bad9fb60b3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_b958a42f-be2f-458a-a676-e6bad9fb60b3" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_b958a42f-be2f-458a-a676-e6bad9fb60b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_b958a42f-be2f-458a-a676-e6bad9fb60b3" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_HotelMember_ecf00719-ac33-4658-b071-6d1efdf9988d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_HotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_srt_HotelMember_ecf00719-ac33-4658-b071-6d1efdf9988d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndustrialGeneralMember_770d2db4-af73-4cc0-9b7d-a0f5ea4a3f1c" xlink:href="fnf-20251231.xsd#fnf_IndustrialGeneralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_fnf_IndustrialGeneralMember_770d2db4-af73-4cc0-9b7d-a0f5ea4a3f1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MixedUsePropertyMember_eb7c0934-7f18-4771-bcff-f731452df89b" xlink:href="fnf-20251231.xsd#fnf_MixedUsePropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_fnf_MixedUsePropertyMember_eb7c0934-7f18-4771-bcff-f731452df89b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MultifamilyMember_9f6629c8-90bf-4c04-bdea-e0b3a3c57156" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MultifamilyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_srt_MultifamilyMember_9f6629c8-90bf-4c04-bdea-e0b3a3c57156" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OfficeBuildingMember_5a8199c4-8075-405e-9305-86215ebfa8ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OfficeBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_srt_OfficeBuildingMember_5a8199c4-8075-405e-9305-86215ebfa8ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RetailSiteMember_4c18044b-5047-4fbf-9dfd-c4a8c067fb63" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RetailSiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_srt_RetailSiteMember_4c18044b-5047-4fbf-9dfd-c4a8c067fb63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StudentHousingMember_3c021ea3-7ec5-496f-b5a7-727655d702c6" xlink:href="fnf-20251231.xsd#fnf_StudentHousingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_fnf_StudentHousingMember_3c021ea3-7ec5-496f-b5a7-727655d702c6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OtherPropertyMember_d1a5c379-2bfe-410e-a884-d6bb1ffbe916" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OtherPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_78da746f-cc4c-42d3-9e70-23230a81a582" xlink:to="loc_srt_OtherPropertyMember_d1a5c379-2bfe-410e-a884-d6bb1ffbe916" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_deecc52e-2028-44e1-a0ac-2af468f167f9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:to="loc_srt_StatementGeographicalAxis_deecc52e-2028-44e1-a0ac-2af468f167f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_deecc52e-2028-44e1-a0ac-2af468f167f9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_deecc52e-2028-44e1-a0ac-2af468f167f9" xlink:to="loc_srt_SegmentGeographicalDomain_deecc52e-2028-44e1-a0ac-2af468f167f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_deecc52e-2028-44e1-a0ac-2af468f167f9" xlink:to="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EastNorthCentralUSMember_c5096600-8ee6-41a7-81f3-022727e43ec4" xlink:href="fnf-20251231.xsd#fnf_EastNorthCentralUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_EastNorthCentralUSMember_c5096600-8ee6-41a7-81f3-022727e43ec4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EastSouthCentralMember_d0a3c256-64bb-4b95-9f99-a61b23475cc7" xlink:href="fnf-20251231.xsd#fnf_EastSouthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_EastSouthCentralMember_d0a3c256-64bb-4b95-9f99-a61b23475cc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MiddleAtlanticUSMember_f7474d19-9205-46e8-bd7c-8869145c4860" xlink:href="fnf-20251231.xsd#fnf_MiddleAtlanticUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_MiddleAtlanticUSMember_f7474d19-9205-46e8-bd7c-8869145c4860" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MountainMember_42d5f8c1-2730-4256-9fea-09101f0fe805" xlink:href="fnf-20251231.xsd#fnf_MountainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_MountainMember_42d5f8c1-2730-4256-9fea-09101f0fe805" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NewEnglandMember_05b3f1af-0a83-4b3f-a0c5-abcee738cb19" xlink:href="fnf-20251231.xsd#fnf_NewEnglandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_NewEnglandMember_05b3f1af-0a83-4b3f-a0c5-abcee738cb19" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PacificUSMember_8baf38df-896f-4218-b5d8-fda01aa15e73" xlink:href="fnf-20251231.xsd#fnf_PacificUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_PacificUSMember_8baf38df-896f-4218-b5d8-fda01aa15e73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_SouthAtlanticUSMember_6c0989b6-e6cd-46ef-92d1-337cb01069d2" xlink:href="fnf-20251231.xsd#fnf_SouthAtlanticUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_SouthAtlanticUSMember_6c0989b6-e6cd-46ef-92d1-337cb01069d2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_WestNorthCentralUSMember_cdf37559-ab72-4021-8086-9cf96b4604b5" xlink:href="fnf-20251231.xsd#fnf_WestNorthCentralUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_WestNorthCentralUSMember_cdf37559-ab72-4021-8086-9cf96b4604b5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_WestSouthCentralUSMember_f39bbc91-301e-45ed-8b1d-d2d65c14c02a" xlink:href="fnf-20251231.xsd#fnf_WestSouthCentralUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aaa513f4-dfd9-4d3a-bb2a-aea4573df637" xlink:to="loc_fnf_WestSouthCentralUSMember_f39bbc91-301e-45ed-8b1d-d2d65c14c02a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_1adfc70c-76c9-47da-8278-299c8865f11c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_1adfc70c-76c9-47da-8278-299c8865f11c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_1adfc70c-76c9-47da-8278-299c8865f11c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_1adfc70c-76c9-47da-8278-299c8865f11c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_1adfc70c-76c9-47da-8278-299c8865f11c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b97b26ea-d0e2-453f-8805-f76741f79b5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_1adfc70c-76c9-47da-8278-299c8865f11c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b97b26ea-d0e2-453f-8805-f76741f79b5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_68d0a9e7-b832-4bf6-9a2b-3a8bd0baa85b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b97b26ea-d0e2-453f-8805-f76741f79b5f" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_68d0a9e7-b832-4bf6-9a2b-3a8bd0baa85b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioAxis_019c966a-c8fe-7e1b-8c49-759aa734633e" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:to="loc_fnf_DebtServiceCoverageRatioAxis_019c966a-c8fe-7e1b-8c49-759aa734633e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7e1b-8c49-759aa734633e_default" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fnf_DebtServiceCoverageRatioAxis_019c966a-c8fe-7e1b-8c49-759aa734633e" xlink:to="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7e1b-8c49-759aa734633e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7c4c-9142-521f202eeff7" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fnf_DebtServiceCoverageRatioAxis_019c966a-c8fe-7e1b-8c49-759aa734633e" xlink:to="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7c4c-9142-521f202eeff7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_GreaterThanOnePointTwoFiveMember_019c966a-c8fe-7c45-af15-266b4ec8f205" xlink:href="fnf-20251231.xsd#fnf_GreaterThanOnePointTwoFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7c4c-9142-521f202eeff7" xlink:to="loc_fnf_GreaterThanOnePointTwoFiveMember_019c966a-c8fe-7c45-af15-266b4ec8f205" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_GreaterThanOneButLessThanOnePointTwoFiveMember_019c966a-c8fe-7cba-adb2-cc73df8b945a" xlink:href="fnf-20251231.xsd#fnf_GreaterThanOneButLessThanOnePointTwoFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7c4c-9142-521f202eeff7" xlink:to="loc_fnf_GreaterThanOneButLessThanOnePointTwoFiveMember_019c966a-c8fe-7cba-adb2-cc73df8b945a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_GreaterThanOnePointZeroZeroMember_019c966a-c8fe-7298-8901-d24591c91f2b" xlink:href="fnf-20251231.xsd#fnf_GreaterThanOnePointZeroZeroMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_019c966a-c8fe-7c4c-9142-521f202eeff7" xlink:to="loc_fnf_GreaterThanOnePointZeroZeroMember_019c966a-c8fe-7298-8901-d24591c91f2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueAxis_019c966a-c8fe-75ca-ad56-2037b40203ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:to="loc_us-gaap_LoanToValueAxis_019c966a-c8fe-75ca-ad56-2037b40203ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-75ca-ad56-2037b40203ed_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanToValueAxis_019c966a-c8fe-75ca-ad56-2037b40203ed" xlink:to="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-75ca-ad56-2037b40203ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-7a27-9b54-e8a1a2d9bc33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanToValueAxis_019c966a-c8fe-75ca-ad56-2037b40203ed" xlink:to="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-7a27-9b54-e8a1a2d9bc33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTVLessThan50PercentMember_019c966a-c8fe-753d-8c0b-d686f4e5f9d1" xlink:href="fnf-20251231.xsd#fnf_LTVLessThan50PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-7a27-9b54-e8a1a2d9bc33" xlink:to="loc_fnf_LTVLessThan50PercentMember_019c966a-c8fe-753d-8c0b-d686f4e5f9d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTV50To5999PercentMember_019c966a-c8fe-7064-acdc-058a2b355587" xlink:href="fnf-20251231.xsd#fnf_LTV50To5999PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-7a27-9b54-e8a1a2d9bc33" xlink:to="loc_fnf_LTV50To5999PercentMember_019c966a-c8fe-7064-acdc-058a2b355587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTV60To7499PercentMember_019c966a-c8fe-7ca7-8678-4b88281b821b" xlink:href="fnf-20251231.xsd#fnf_LTV60To7499PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-7a27-9b54-e8a1a2d9bc33" xlink:to="loc_fnf_LTV60To7499PercentMember_019c966a-c8fe-7ca7-8678-4b88281b821b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTV75To8499PercentMember_019c966a-c8fe-7cb8-b30c-243c649a3eb4" xlink:href="fnf-20251231.xsd#fnf_LTV75To8499PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019c966a-c8fe-7a27-9b54-e8a1a2d9bc33" xlink:to="loc_fnf_LTV75To8499PercentMember_019c966a-c8fe-7cb8-b30c-243c649a3eb4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019c966a-c8fe-7204-a260-3911d84a22bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_befe8835-3419-4a17-b745-04711813eccf" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019c966a-c8fe-7204-a260-3911d84a22bf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c966a-c8fe-7204-a260-3911d84a22bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019c966a-c8fe-7204-a260-3911d84a22bf" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c966a-c8fe-7204-a260-3911d84a22bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c9674-6091-749c-9ae7-417d2877bae8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019c966a-c8fe-7204-a260-3911d84a22bf" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c9674-6091-749c-9ae7-417d2877bae8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c966a-c8fe-7901-a150-7e3562d51ea3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019c9674-6091-749c-9ae7-417d2877bae8" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c966a-c8fe-7901-a150-7e3562d51ea3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019c966a-c8fe-7788-8e24-ca5d41273422" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019c966a-c8fe-7901-a150-7e3562d51ea3" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019c966a-c8fe-7788-8e24-ca5d41273422" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_ef3996cf-d8f5-41d1-af6b-9b03e9a5281b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_ef3996cf-d8f5-41d1-af6b-9b03e9a5281b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_8c86ff5c-3771-436e-b11d-61466570401d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_8c86ff5c-3771-436e-b11d-61466570401d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_444f709a-f5ca-4f0d-a55f-3ed92f97bc0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_444f709a-f5ca-4f0d-a55f-3ed92f97bc0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_6d98eaf4-2336-4b77-b12c-a610a7cca6c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_6d98eaf4-2336-4b77-b12c-a610a7cca6c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019c966a-c8fe-792e-b2b7-21ddecd153f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_3afb4fe3-0c6e-4063-81b9-79d6fa6b7278" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019c966a-c8fe-792e-b2b7-21ddecd153f7" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsCommercialMortgageLoansSegregatedbyAgingofLoansandChargeOffsbyYearofOriginationDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsCommercialMortgageLoansSegregatedbyAgingofLoansandChargeOffsbyYearofOriginationDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsCommercialMortgageLoansSegregatedbyAgingofLoansandChargeOffsbyYearofOriginationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_2177cd23-4a95-4057-bb6f-3496492cb979" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_b907f098-5a5d-46c8-b401-220bbb65eaae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_2177cd23-4a95-4057-bb6f-3496492cb979" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_b907f098-5a5d-46c8-b401-220bbb65eaae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b5a8fb1b-ee5e-46d8-9fa7-07a0fa994eab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_b907f098-5a5d-46c8-b401-220bbb65eaae" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b5a8fb1b-ee5e-46d8-9fa7-07a0fa994eab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b5a8fb1b-ee5e-46d8-9fa7-07a0fa994eab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b5a8fb1b-ee5e-46d8-9fa7-07a0fa994eab" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b5a8fb1b-ee5e-46d8-9fa7-07a0fa994eab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bbdf972b-417f-440b-92bc-6fc3fdf03163" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b5a8fb1b-ee5e-46d8-9fa7-07a0fa994eab" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bbdf972b-417f-440b-92bc-6fc3fdf03163" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_9832e0d4-b2be-4e29-a4a9-f1936e182924" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_bbdf972b-417f-440b-92bc-6fc3fdf03163" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_9832e0d4-b2be-4e29-a4a9-f1936e182924" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_0ae01934-a2af-4d2d-985e-4a6182af9851" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_b907f098-5a5d-46c8-b401-220bbb65eaae" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_0ae01934-a2af-4d2d-985e-4a6182af9851" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_0ae01934-a2af-4d2d-985e-4a6182af9851_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_0ae01934-a2af-4d2d-985e-4a6182af9851" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_0ae01934-a2af-4d2d-985e-4a6182af9851_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_446ce006-d770-4786-aea6-4c36d1240595" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_0ae01934-a2af-4d2d-985e-4a6182af9851" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_446ce006-d770-4786-aea6-4c36d1240595" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_6590dc08-3f88-4cec-8774-e88ac6c8716d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables1To29DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_446ce006-d770-4786-aea6-4c36d1240595" xlink:to="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_6590dc08-3f88-4cec-8774-e88ac6c8716d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancialAsset30To89DaysPastDueMember_7c780a03-7389-4c58-8ead-db2a6f68f185" xlink:href="fnf-20251231.xsd#fnf_FinancialAsset30To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_446ce006-d770-4786-aea6-4c36d1240595" xlink:to="loc_fnf_FinancialAsset30To89DaysPastDueMember_7c780a03-7389-4c58-8ead-db2a6f68f185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_f63740e1-c995-4723-a5eb-93f873f1137e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_446ce006-d770-4786-aea6-4c36d1240595" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_f63740e1-c995-4723-a5eb-93f873f1137e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:href="fnf-20251231.xsd#fnf_CreditQualityIndicatorCurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_2177cd23-4a95-4057-bb6f-3496492cb979" xlink:to="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_5ee3b42b-ac89-4f21-9de9-be0f250db1eb" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_5ee3b42b-ac89-4f21-9de9-be0f250db1eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_55393e78-a51f-4bc3-b4ba-779634dff0be" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_55393e78-a51f-4bc3-b4ba-779634dff0be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_849a36be-f3d7-4060-9b4b-c11e863cda57" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_849a36be-f3d7-4060-9b4b-c11e863cda57" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_29f063d7-9cd3-4fa6-8e5c-3160d1c1cad0" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_29f063d7-9cd3-4fa6-8e5c-3160d1c1cad0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_6ec510c9-7ff8-4b3f-a892-7edef165ae7b" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_6ec510c9-7ff8-4b3f-a892-7edef165ae7b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_5a2fc02b-a941-4489-8d1b-a1ee57b15d30" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_5a2fc02b-a941-4489-8d1b-a1ee57b15d30" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_63de8e57-d82d-4d41-892f-66ad159c8c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_bbce7913-b604-495d-b641-a8db3bbfb41c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_63de8e57-d82d-4d41-892f-66ad159c8c9e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditQualityIndicatorPriorYearAbstract_98baed0e-701d-40c4-abf9-ec66f90ecf15" xlink:href="fnf-20251231.xsd#fnf_CreditQualityIndicatorPriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_2177cd23-4a95-4057-bb6f-3496492cb979" xlink:to="loc_fnf_CreditQualityIndicatorPriorYearAbstract_98baed0e-701d-40c4-abf9-ec66f90ecf15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_8afc86de-19c5-45d1-8ac3-55074d96a791" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_8c2d8aee-b1e6-4421-a0e9-f5285c9cdd84" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_9d3ecdda-4dc5-46f7-9035-dd2a000526b5" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_0e09099e-4c2a-4973-b6e4-7611b0ac0753" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_b47565c9-ba52-46e3-a1ef-2fe9b9b529d2" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_256af2b7-fece-4961-b5eb-41197352e142" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_8edb246f-be25-47be-befc-80d2a6f4e1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsInvestmentinCMLsbyLoantoValueandDebtServiceCoverageRatiosDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsInvestmentinCMLsbyLoantoValueandDebtServiceCoverageRatiosDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsInvestmentinCMLsbyLoantoValueandDebtServiceCoverageRatiosDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_92b10e78-3078-4ee4-a6b5-c44bad4446c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_ab7c00c4-e9a5-4718-b1b0-a0067401fbc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_92b10e78-3078-4ee4-a6b5-c44bad4446c2" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_ab7c00c4-e9a5-4718-b1b0-a0067401fbc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioAxis_bc062c5b-328d-4747-ba5c-67c685551b8d" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_ab7c00c4-e9a5-4718-b1b0-a0067401fbc6" xlink:to="loc_fnf_DebtServiceCoverageRatioAxis_bc062c5b-328d-4747-ba5c-67c685551b8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioDomain_bc062c5b-328d-4747-ba5c-67c685551b8d_default" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fnf_DebtServiceCoverageRatioAxis_bc062c5b-328d-4747-ba5c-67c685551b8d" xlink:to="loc_fnf_DebtServiceCoverageRatioDomain_bc062c5b-328d-4747-ba5c-67c685551b8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtServiceCoverageRatioDomain_67a89726-945b-451b-a591-d79a2a0d95cc" xlink:href="fnf-20251231.xsd#fnf_DebtServiceCoverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fnf_DebtServiceCoverageRatioAxis_bc062c5b-328d-4747-ba5c-67c685551b8d" xlink:to="loc_fnf_DebtServiceCoverageRatioDomain_67a89726-945b-451b-a591-d79a2a0d95cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_GreaterThanOnePointTwoFiveMember_2f8bfb1a-e026-4b97-83ce-b4d6d30e4fab" xlink:href="fnf-20251231.xsd#fnf_GreaterThanOnePointTwoFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_67a89726-945b-451b-a591-d79a2a0d95cc" xlink:to="loc_fnf_GreaterThanOnePointTwoFiveMember_2f8bfb1a-e026-4b97-83ce-b4d6d30e4fab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_GreaterThanOneButLessThanOnePointTwoFiveMember_484920f9-167b-42ce-aa78-15cf4e700ecd" xlink:href="fnf-20251231.xsd#fnf_GreaterThanOneButLessThanOnePointTwoFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_67a89726-945b-451b-a591-d79a2a0d95cc" xlink:to="loc_fnf_GreaterThanOneButLessThanOnePointTwoFiveMember_484920f9-167b-42ce-aa78-15cf4e700ecd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_GreaterThanOnePointZeroZeroMember_c6665602-0ad7-4ed8-9135-e17b4c743207" xlink:href="fnf-20251231.xsd#fnf_GreaterThanOnePointZeroZeroMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_67a89726-945b-451b-a591-d79a2a0d95cc" xlink:to="loc_fnf_GreaterThanOnePointZeroZeroMember_c6665602-0ad7-4ed8-9135-e17b4c743207" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LessThanOnePointZeroZeroMember_771d4b88-8849-48d3-858d-25a6585574f3" xlink:href="fnf-20251231.xsd#fnf_LessThanOnePointZeroZeroMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtServiceCoverageRatioDomain_67a89726-945b-451b-a591-d79a2a0d95cc" xlink:to="loc_fnf_LessThanOnePointZeroZeroMember_771d4b88-8849-48d3-858d-25a6585574f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_99888d51-8d5c-4342-b171-e3cd8a2a42c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_ab7c00c4-e9a5-4718-b1b0-a0067401fbc6" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_99888d51-8d5c-4342-b171-e3cd8a2a42c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_99888d51-8d5c-4342-b171-e3cd8a2a42c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_99888d51-8d5c-4342-b171-e3cd8a2a42c0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_99888d51-8d5c-4342-b171-e3cd8a2a42c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_94055cfd-6325-4294-bedc-dfe06bfd8b35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_99888d51-8d5c-4342-b171-e3cd8a2a42c0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_94055cfd-6325-4294-bedc-dfe06bfd8b35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_319aa985-2291-44a2-8317-b0c63473098c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_94055cfd-6325-4294-bedc-dfe06bfd8b35" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_319aa985-2291-44a2-8317-b0c63473098c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueAxis_0965fece-2f95-44a3-8300-4cc3623cc076" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_ab7c00c4-e9a5-4718-b1b0-a0067401fbc6" xlink:to="loc_us-gaap_LoanToValueAxis_0965fece-2f95-44a3-8300-4cc3623cc076" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueDomain_0965fece-2f95-44a3-8300-4cc3623cc076_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanToValueAxis_0965fece-2f95-44a3-8300-4cc3623cc076" xlink:to="loc_us-gaap_LoanToValueDomain_0965fece-2f95-44a3-8300-4cc3623cc076_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueDomain_fd7e3370-ef6b-4cdd-a386-ac3b535ca276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanToValueAxis_0965fece-2f95-44a3-8300-4cc3623cc076" xlink:to="loc_us-gaap_LoanToValueDomain_fd7e3370-ef6b-4cdd-a386-ac3b535ca276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTVLessThan50PercentMember_7d7edd71-0598-4661-b16a-2243fbcdb558" xlink:href="fnf-20251231.xsd#fnf_LTVLessThan50PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_fd7e3370-ef6b-4cdd-a386-ac3b535ca276" xlink:to="loc_fnf_LTVLessThan50PercentMember_7d7edd71-0598-4661-b16a-2243fbcdb558" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTV50To5999PercentMember_fc7ae829-9e64-4dd8-858e-bf88afe8ad23" xlink:href="fnf-20251231.xsd#fnf_LTV50To5999PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_fd7e3370-ef6b-4cdd-a386-ac3b535ca276" xlink:to="loc_fnf_LTV50To5999PercentMember_fc7ae829-9e64-4dd8-858e-bf88afe8ad23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTV60To7499PercentMember_bd5d13e3-8503-4052-88c1-f6f747df8394" xlink:href="fnf-20251231.xsd#fnf_LTV60To7499PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_fd7e3370-ef6b-4cdd-a386-ac3b535ca276" xlink:to="loc_fnf_LTV60To7499PercentMember_bd5d13e3-8503-4052-88c1-f6f747df8394" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LTV75To8499PercentMember_bf287a4e-ef78-4fb8-b811-eb2630220978" xlink:href="fnf-20251231.xsd#fnf_LTV75To8499PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_fd7e3370-ef6b-4cdd-a386-ac3b535ca276" xlink:to="loc_fnf_LTV75To8499PercentMember_bf287a4e-ef78-4fb8-b811-eb2630220978" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_cda90fa0-500c-475e-840c-ba19976997ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_ab7c00c4-e9a5-4718-b1b0-a0067401fbc6" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_cda90fa0-500c-475e-840c-ba19976997ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_cda90fa0-500c-475e-840c-ba19976997ab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_cda90fa0-500c-475e-840c-ba19976997ab" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_cda90fa0-500c-475e-840c-ba19976997ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_e619931d-4b88-4b9d-bda1-af1ff822cc11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_cda90fa0-500c-475e-840c-ba19976997ab" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_e619931d-4b88-4b9d-bda1-af1ff822cc11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01635dcc-8ad6-4c13-846a-88cb8cd85559" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_e619931d-4b88-4b9d-bda1-af1ff822cc11" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01635dcc-8ad6-4c13-846a-88cb8cd85559" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_976fbb46-5a22-4273-85e1-5e8afc73748c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01635dcc-8ad6-4c13-846a-88cb8cd85559" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_976fbb46-5a22-4273-85e1-5e8afc73748c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_22597648-3129-4b38-85c7-df2c606f2f75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_92b10e78-3078-4ee4-a6b5-c44bad4446c2" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_22597648-3129-4b38-85c7-df2c606f2f75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_2a3a142e-9ad0-46cd-8218-0f212d467bdf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_92b10e78-3078-4ee4-a6b5-c44bad4446c2" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_2a3a142e-9ad0-46cd-8218-0f212d467bdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_6222e4dc-d230-47cb-a714-88cc74cd2119" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_92b10e78-3078-4ee4-a6b5-c44bad4446c2" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_6222e4dc-d230-47cb-a714-88cc74cd2119" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:href="fnf-20251231.xsd#fnf_CreditQualityIndicatorCurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_6222e4dc-d230-47cb-a714-88cc74cd2119" xlink:to="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_023c49ac-bfeb-4394-b0b4-46e7e8d2ac01" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_023c49ac-bfeb-4394-b0b4-46e7e8d2ac01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_b181b457-e3cd-4901-a296-e16afd4050e8" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_b181b457-e3cd-4901-a296-e16afd4050e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_39c259fd-688d-4bf2-b3b9-8fa1a283e3a2" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_39c259fd-688d-4bf2-b3b9-8fa1a283e3a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_9ee78151-33ee-499c-8da4-1ed645d9905c" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_9ee78151-33ee-499c-8da4-1ed645d9905c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_361a2bc1-873d-4be7-b28a-93bb0930ac73" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_361a2bc1-873d-4be7-b28a-93bb0930ac73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_0aec5859-6103-4d39-bf10-78b8ece4e99b" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_6d2467aa-549d-4091-a78b-55d3b96a24d4" xlink:to="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_0aec5859-6103-4d39-bf10-78b8ece4e99b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_94a00678-a817-45de-b665-ddcd026b6c94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditQualityIndicatorPriorYearAbstract_f18d0fa5-55f3-4ef4-be9a-ead75c483f74" xlink:href="fnf-20251231.xsd#fnf_CreditQualityIndicatorPriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_6222e4dc-d230-47cb-a714-88cc74cd2119" xlink:to="loc_fnf_CreditQualityIndicatorPriorYearAbstract_f18d0fa5-55f3-4ef4-be9a-ead75c483f74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_07f4f0f1-eb84-4f73-9efe-458cfeb8348f" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_08f18540-ad9c-414e-914b-4d9e40e5b304" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_8c325eb7-f2bb-46dd-9a7c-6d1c192b7dfa" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_065f1f87-c7af-42a5-a8c6-46189f8e617e" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_da697734-a3a9-4ba8-b7e8-6ad71103e9d5" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_92e028b1-d5e6-43d6-9997-6007eeecaf72" xlink:href="fnf-20251231.xsd#fnf_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_e41470ac-1660-4121-8012-a08322406bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsResidentialMortgageLoanbyStateDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsResidentialMortgageLoanbyStateDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsResidentialMortgageLoanbyStateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_0e17e3f9-2c67-4b56-b299-1cd89ec51796" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_0e4ad5b2-ed40-445f-a9d7-dad34a2be6fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_0e17e3f9-2c67-4b56-b299-1cd89ec51796" xlink:to="loc_us-gaap_ConcentrationRiskTable_0e4ad5b2-ed40-445f-a9d7-dad34a2be6fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_7a14110f-f036-4587-95da-ba88911ec5fa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_0e4ad5b2-ed40-445f-a9d7-dad34a2be6fe" xlink:to="loc_srt_StatementGeographicalAxis_7a14110f-f036-4587-95da-ba88911ec5fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_7a14110f-f036-4587-95da-ba88911ec5fa_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_7a14110f-f036-4587-95da-ba88911ec5fa" xlink:to="loc_srt_SegmentGeographicalDomain_7a14110f-f036-4587-95da-ba88911ec5fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d9e503d8-02e2-4b09-834d-15eb3d289057" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_7a14110f-f036-4587-95da-ba88911ec5fa" xlink:to="loc_srt_SegmentGeographicalDomain_d9e503d8-02e2-4b09-834d-15eb3d289057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_019c0426-4572-76ad-9553-8873f27a6e7b" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d9e503d8-02e2-4b09-834d-15eb3d289057" xlink:to="loc_stpr_CA_019c0426-4572-76ad-9553-8873f27a6e7b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_FL_019c042c-2872-7c12-a661-7da6b755810b" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_FL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d9e503d8-02e2-4b09-834d-15eb3d289057" xlink:to="loc_stpr_FL_019c042c-2872-7c12-a661-7da6b755810b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NY_019c5c06-1ef4-73f5-a2f5-c01c12e1f166" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d9e503d8-02e2-4b09-834d-15eb3d289057" xlink:to="loc_stpr_NY_019c5c06-1ef4-73f5-a2f5-c01c12e1f166" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AllOtherStatesMember_671dfce0-2e60-4b1b-9f44-b486285bfd7d" xlink:href="fnf-20251231.xsd#fnf_AllOtherStatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d9e503d8-02e2-4b09-834d-15eb3d289057" xlink:to="loc_fnf_AllOtherStatesMember_671dfce0-2e60-4b1b-9f44-b486285bfd7d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b181e32c-1660-4ebb-a726-484e56ad4428" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_0e4ad5b2-ed40-445f-a9d7-dad34a2be6fe" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b181e32c-1660-4ebb-a726-484e56ad4428" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b181e32c-1660-4ebb-a726-484e56ad4428_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b181e32c-1660-4ebb-a726-484e56ad4428" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b181e32c-1660-4ebb-a726-484e56ad4428_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_358a5954-82c8-47a2-bc91-1da5b4668331" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b181e32c-1660-4ebb-a726-484e56ad4428" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_358a5954-82c8-47a2-bc91-1da5b4668331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_cf56a2b9-e1a4-46de-9cce-e4929b6d59e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_358a5954-82c8-47a2-bc91-1da5b4668331" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_cf56a2b9-e1a4-46de-9cce-e4929b6d59e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_9ddcb105-dbc6-44ce-93cd-e6abc4151076" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0e17e3f9-2c67-4b56-b299-1cd89ec51796" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_9ddcb105-dbc6-44ce-93cd-e6abc4151076" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_ff0f9055-d6e1-41cc-93a2-49b7efa819e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0e17e3f9-2c67-4b56-b299-1cd89ec51796" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_ff0f9055-d6e1-41cc-93a2-49b7efa819e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_4759b82f-6e55-43c6-82d4-0b55593ae466" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0e17e3f9-2c67-4b56-b299-1cd89ec51796" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_4759b82f-6e55-43c6-82d4-0b55593ae466" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_d0cda48c-f9d8-49ed-b16a-3d017b6770af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_0e17e3f9-2c67-4b56-b299-1cd89ec51796" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_d0cda48c-f9d8-49ed-b16a-3d017b6770af" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsCreditQualityofRMLsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsCreditQualityofRMLsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsCreditQualityofRMLsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_8b7dbfd0-88d4-4a64-b650-bc1c7d10a377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_5e88d28e-e947-4218-ab62-e6dec51e3e6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_8b7dbfd0-88d4-4a64-b650-bc1c7d10a377" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_5e88d28e-e947-4218-ab62-e6dec51e3e6f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5b1da8ff-0220-4dda-9fd3-f0da3ab81cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_5e88d28e-e947-4218-ab62-e6dec51e3e6f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5b1da8ff-0220-4dda-9fd3-f0da3ab81cc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5b1da8ff-0220-4dda-9fd3-f0da3ab81cc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5b1da8ff-0220-4dda-9fd3-f0da3ab81cc6" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5b1da8ff-0220-4dda-9fd3-f0da3ab81cc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_227611d9-60d0-4d2e-9f17-e95a647f2276" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5b1da8ff-0220-4dda-9fd3-f0da3ab81cc6" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_227611d9-60d0-4d2e-9f17-e95a647f2276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_06e507b1-68ba-4d4b-a020-3506dd1f06b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_227611d9-60d0-4d2e-9f17-e95a647f2276" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_06e507b1-68ba-4d4b-a020-3506dd1f06b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_bb55cfb4-6759-4600-ba59-55ea757c156c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_5e88d28e-e947-4218-ab62-e6dec51e3e6f" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_bb55cfb4-6759-4600-ba59-55ea757c156c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_bb55cfb4-6759-4600-ba59-55ea757c156c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_bb55cfb4-6759-4600-ba59-55ea757c156c" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_bb55cfb4-6759-4600-ba59-55ea757c156c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_7eaa3b49-ced1-4a0d-951e-b388c013c6f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_bb55cfb4-6759-4600-ba59-55ea757c156c" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_7eaa3b49-ced1-4a0d-951e-b388c013c6f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformingFinancingReceivableMember_fdb5c4b8-e38e-4885-a6bd-12537e79a6c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_7eaa3b49-ced1-4a0d-951e-b388c013c6f6" xlink:to="loc_us-gaap_PerformingFinancingReceivableMember_fdb5c4b8-e38e-4885-a6bd-12537e79a6c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonperformingFinancingReceivableMember_90b442e2-33d6-4d10-88b7-6cbebaf10faa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonperformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_7eaa3b49-ced1-4a0d-951e-b388c013c6f6" xlink:to="loc_us-gaap_NonperformingFinancingReceivableMember_90b442e2-33d6-4d10-88b7-6cbebaf10faa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_5b34c442-d322-4538-bd37-698a4955ff8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_8b7dbfd0-88d4-4a64-b650-bc1c7d10a377" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_5b34c442-d322-4538-bd37-698a4955ff8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_45a021cc-88ac-40a9-9f0b-8260b72efc89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_8b7dbfd0-88d4-4a64-b650-bc1c7d10a377" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_45a021cc-88ac-40a9-9f0b-8260b72efc89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_4f270f1a-2152-4b99-a5f3-9942de865b01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_8b7dbfd0-88d4-4a64-b650-bc1c7d10a377" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_4f270f1a-2152-4b99-a5f3-9942de865b01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_4d793de0-6975-4e49-a970-1d43869ddd3d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_8b7dbfd0-88d4-4a64-b650-bc1c7d10a377" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_4d793de0-6975-4e49-a970-1d43869ddd3d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsResidentialLoansSegregatedbyRiskRatingExposureandNonaccrualLoansbyAmortizedCostDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsResidentialLoansSegregatedbyRiskRatingExposureandNonaccrualLoansbyAmortizedCostDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsResidentialLoansSegregatedbyRiskRatingExposureandNonaccrualLoansbyAmortizedCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_b9a52e7b-0d46-4a37-af40-41627caab4ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_92dc63f7-7dcb-486e-a0b2-5981ac3f1e86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_b9a52e7b-0d46-4a37-af40-41627caab4ad" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_92dc63f7-7dcb-486e-a0b2-5981ac3f1e86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_76aad549-557e-41fa-9954-6c80b72558ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_92dc63f7-7dcb-486e-a0b2-5981ac3f1e86" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_76aad549-557e-41fa-9954-6c80b72558ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_76aad549-557e-41fa-9954-6c80b72558ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_76aad549-557e-41fa-9954-6c80b72558ee" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_76aad549-557e-41fa-9954-6c80b72558ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_732b1ecb-98c2-4653-9e30-030e2f572ed1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_76aad549-557e-41fa-9954-6c80b72558ee" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_732b1ecb-98c2-4653-9e30-030e2f572ed1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_ba28bd4e-d4a0-4dec-a594-f70d71011785" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables1To29DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_732b1ecb-98c2-4653-9e30-030e2f572ed1" xlink:to="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_ba28bd4e-d4a0-4dec-a594-f70d71011785" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FinancialAsset30To89DaysPastDueMember_44b2c4b4-3d43-4574-89aa-7c3fb193ee8e" xlink:href="fnf-20251231.xsd#fnf_FinancialAsset30To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_732b1ecb-98c2-4653-9e30-030e2f572ed1" xlink:to="loc_fnf_FinancialAsset30To89DaysPastDueMember_44b2c4b4-3d43-4574-89aa-7c3fb193ee8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_58922f46-d63c-4b96-8b86-1e86d2b344ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_732b1ecb-98c2-4653-9e30-030e2f572ed1" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_58922f46-d63c-4b96-8b86-1e86d2b344ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_afa24008-1831-41b4-9724-b8cc9a1a7d08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_92dc63f7-7dcb-486e-a0b2-5981ac3f1e86" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_afa24008-1831-41b4-9724-b8cc9a1a7d08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_afa24008-1831-41b4-9724-b8cc9a1a7d08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_afa24008-1831-41b4-9724-b8cc9a1a7d08" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_afa24008-1831-41b4-9724-b8cc9a1a7d08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_84a75a74-7e1a-4e3c-b111-bb16f8616021" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_afa24008-1831-41b4-9724-b8cc9a1a7d08" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_84a75a74-7e1a-4e3c-b111-bb16f8616021" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_cc452b50-4c06-41b1-9887-c2d24754bf62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_84a75a74-7e1a-4e3c-b111-bb16f8616021" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_cc452b50-4c06-41b1-9887-c2d24754bf62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:href="fnf-20251231.xsd#fnf_CreditQualityIndicatorCurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_b9a52e7b-0d46-4a37-af40-41627caab4ad" xlink:to="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_77718efe-22a8-451b-ab83-d5fbdd3e58c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_77718efe-22a8-451b-ab83-d5fbdd3e58c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_cbad6360-759b-44e5-85c8-733740568499" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_cbad6360-759b-44e5-85c8-733740568499" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_ae34ad9a-ff6a-4040-b821-95a221217205" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_ae34ad9a-ff6a-4040-b821-95a221217205" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_8dd08074-362a-4f8d-a4c6-37e2345c2fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_8dd08074-362a-4f8d-a4c6-37e2345c2fb9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_c575dd6e-c044-4726-855b-5868d49fe299" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_c575dd6e-c044-4726-855b-5868d49fe299" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_17a5a439-ca67-4359-b1b2-bae02df34b9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_17a5a439-ca67-4359-b1b2-bae02df34b9d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_2dc842fb-289f-49a0-8f2f-f5176216cbcb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_CreditQualityIndicatorCurrentYearAbstract_3cdc659e-0414-4f80-97b8-a93ed71d7119" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_2dc842fb-289f-49a0-8f2f-f5176216cbcb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditQualityIndicatorPriorYearAbstract_a456c2d6-c367-4c64-9306-bc1c7c0750d4" xlink:href="fnf-20251231.xsd#fnf_CreditQualityIndicatorPriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_b9a52e7b-0d46-4a37-af40-41627caab4ad" xlink:to="loc_fnf_CreditQualityIndicatorPriorYearAbstract_a456c2d6-c367-4c64-9306-bc1c7c0750d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_933fe899-1cd5-4bd8-b86f-da4affcb317b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_98af033a-5cf1-437a-ba76-179988be041b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_db84d12e-d846-4b78-a3af-17973eb6c83f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_b0523460-bb5e-4099-b67c-db57a7d7239f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_9e48204b-66b7-4ad1-913d-352c94114f79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_205d5591-f41c-44aa-b2d3-5dea2ff23668" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_17a05bbe-ad66-4f97-a09e-2c7320df9324" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsAmortizedCostsofNonaccrualLoansDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsAmortizedCostsofNonaccrualLoansDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsAmortizedCostsofNonaccrualLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ada97ebd-24ac-407e-8837-3af13632d1cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_bcbabe60-e3f8-4bb0-86b6-da10dc2803a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ada97ebd-24ac-407e-8837-3af13632d1cc" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_bcbabe60-e3f8-4bb0-86b6-da10dc2803a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b0e0bf45-c526-499a-8e79-096fbe80923c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_bcbabe60-e3f8-4bb0-86b6-da10dc2803a1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b0e0bf45-c526-499a-8e79-096fbe80923c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b0e0bf45-c526-499a-8e79-096fbe80923c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b0e0bf45-c526-499a-8e79-096fbe80923c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_b0e0bf45-c526-499a-8e79-096fbe80923c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6a174e37-3beb-4fd9-9b1a-806e33c85548" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_b0e0bf45-c526-499a-8e79-096fbe80923c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6a174e37-3beb-4fd9-9b1a-806e33c85548" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_0a54b37d-42c5-4eb9-a680-5a36cf90a814" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6a174e37-3beb-4fd9-9b1a-806e33c85548" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_0a54b37d-42c5-4eb9-a680-5a36cf90a814" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_f3466071-c037-424b-9388-9eed82998a40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6a174e37-3beb-4fd9-9b1a-806e33c85548" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_f3466071-c037-424b-9388-9eed82998a40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_0e8dbed2-b785-4dd4-a0a6-6f921c536a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ada97ebd-24ac-407e-8837-3af13632d1cc" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_0e8dbed2-b785-4dd4-a0a6-6f921c536a3c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsChangesinAllowanceforExpectedCreditLossesonMortgageLoansDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsChangesinAllowanceforExpectedCreditLossesonMortgageLoansDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsChangesinAllowanceforExpectedCreditLossesonMortgageLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_0cebd8b6-2128-4676-9ca5-0fc4db2e193e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_af6da361-aa3e-4f91-bb06-b6a662762c3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_0cebd8b6-2128-4676-9ca5-0fc4db2e193e" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_af6da361-aa3e-4f91-bb06-b6a662762c3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_854369a1-10f4-4dc5-a473-f53f0a5b5a34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_af6da361-aa3e-4f91-bb06-b6a662762c3a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_854369a1-10f4-4dc5-a473-f53f0a5b5a34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_854369a1-10f4-4dc5-a473-f53f0a5b5a34_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_854369a1-10f4-4dc5-a473-f53f0a5b5a34" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_854369a1-10f4-4dc5-a473-f53f0a5b5a34_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e23f2399-c5e2-450d-9d32-a837e5955034" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_854369a1-10f4-4dc5-a473-f53f0a5b5a34" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e23f2399-c5e2-450d-9d32-a837e5955034" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_5511a307-cb1d-4bd5-b694-21639def4347" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e23f2399-c5e2-450d-9d32-a837e5955034" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_5511a307-cb1d-4bd5-b694-21639def4347" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_eff0a39e-9271-4baa-b907-473ad2944f92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_e23f2399-c5e2-450d-9d32-a837e5955034" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_eff0a39e-9271-4baa-b907-473ad2944f92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_41d44270-7e00-4cb5-80f6-b7e9b98c9063" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_0cebd8b6-2128-4676-9ca5-0fc4db2e193e" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_41d44270-7e00-4cb5-80f6-b7e9b98c9063" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_757bf628-3414-4ec0-8943-a685e69162f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_41d44270-7e00-4cb5-80f6-b7e9b98c9063" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_757bf628-3414-4ec0-8943-a685e69162f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_a0a012aa-9289-4b00-803a-2c0c35d67f18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_41d44270-7e00-4cb5-80f6-b7e9b98c9063" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_a0a012aa-9289-4b00-803a-2c0c35d67f18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_4a05b77e-5016-490c-b8d1-f69da42881fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsMajorSourcesofInterestandInvestmentIncomeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsMajorSourcesofInterestandInvestmentIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsMajorSourcesofInterestandInvestmentIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_e3f8eacf-8866-4fd7-b0d8-9937770bf50a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_4a501246-4c59-49f7-a20a-58290c3b481e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_e3f8eacf-8866-4fd7-b0d8-9937770bf50a" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_4a501246-4c59-49f7-a20a-58290c3b481e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_8fd2a021-bf5b-455a-98ca-8906dd64c833" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_4a501246-4c59-49f7-a20a-58290c3b481e" xlink:to="loc_us-gaap_InvestmentTypeAxis_8fd2a021-bf5b-455a-98ca-8906dd64c833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_8fd2a021-bf5b-455a-98ca-8906dd64c833_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_8fd2a021-bf5b-455a-98ca-8906dd64c833" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_8fd2a021-bf5b-455a-98ca-8906dd64c833_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_8fd2a021-bf5b-455a-98ca-8906dd64c833" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_bd215e02-780d-416e-a85b-9f5f6cb12331" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_us-gaap_DebtSecuritiesMember_bd215e02-780d-416e-a85b-9f5f6cb12331" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_e0e97197-377e-47a9-b12f-81efa00b4281" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_us-gaap_PreferredStockMember_e0e97197-377e-47a9-b12f-81efa00b4281" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c5c10-24a7-7e25-a67c-1f884fbc6548" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_us-gaap_CommonStockMember_019c5c10-24a7-7e25-a67c-1f884fbc6548" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MortgageLoansMember_e4406fd0-4f60-47da-b8a0-deaa02b7af0f" xlink:href="fnf-20251231.xsd#fnf_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_fnf_MortgageLoansMember_e4406fd0-4f60-47da-b8a0-deaa02b7af0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestedCashAndShortTermInvestmentsMember_a950e1cc-befb-4d40-a233-810241a96258" xlink:href="fnf-20251231.xsd#fnf_InvestedCashAndShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_fnf_InvestedCashAndShortTermInvestmentsMember_a950e1cc-befb-4d40-a233-810241a96258" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TaxDeferredPropertyExchangeMember_07cc8f84-34c5-43c3-a7a1-6b3ffa1cae8f" xlink:href="fnf-20251231.xsd#fnf_TaxDeferredPropertyExchangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_fnf_TaxDeferredPropertyExchangeMember_07cc8f84-34c5-43c3-a7a1-6b3ffa1cae8f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_fe62bb92-a85a-4b5a-92d7-9909099836d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_cb53c653-6b5b-4253-8e0a-64b52f5cd870" xlink:to="loc_us-gaap_OtherInvestmentsMember_fe62bb92-a85a-4b5a-92d7-9909099836d7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_a928d5df-fa8c-472f-928e-44532a34a486" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_e3f8eacf-8866-4fd7-b0d8-9937770bf50a" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_a928d5df-fa8c-472f-928e-44532a34a486" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LimitedPartnershipsInvestmentIncomeNet_019b2ea8-1e53-7ff6-b7be-c0849e555236" xlink:href="fnf-20251231.xsd#fnf_LimitedPartnershipsInvestmentIncomeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_e3f8eacf-8866-4fd7-b0d8-9937770bf50a" xlink:to="loc_fnf_LimitedPartnershipsInvestmentIncomeNet_019b2ea8-1e53-7ff6-b7be-c0849e555236" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_80111faf-4aec-4444-982b-a430b97e8937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_e3f8eacf-8866-4fd7-b0d8-9937770bf50a" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_80111faf-4aec-4444-982b-a430b97e8937" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_58064876-9cde-4c9d-8758-62035c04a78d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_e3f8eacf-8866-4fd7-b0d8-9937770bf50a" xlink:to="loc_us-gaap_NetInvestmentIncome_58064876-9cde-4c9d-8758-62035c04a78d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsInvestmentGainsLossesNetDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsInvestmentGainsLossesNetDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsInvestmentGainsLossesNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_71402cbb-afe9-4111-b5cb-b529d937e2ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_71402cbb-afe9-4111-b5cb-b529d937e2ca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_e9184734-a42c-455e-8126-5d6ad89a8820" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_71402cbb-afe9-4111-b5cb-b529d937e2ca" xlink:to="loc_us-gaap_InvestmentTypeAxis_e9184734-a42c-455e-8126-5d6ad89a8820" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_e9184734-a42c-455e-8126-5d6ad89a8820_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_e9184734-a42c-455e-8126-5d6ad89a8820" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_e9184734-a42c-455e-8126-5d6ad89a8820_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_2d825781-0d4a-43f9-8756-b15de02e064e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_e9184734-a42c-455e-8126-5d6ad89a8820" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_2d825781-0d4a-43f9-8756-b15de02e064e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_79d33bf3-7536-4d2b-b0fb-44498f48e3a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_2d825781-0d4a-43f9-8756-b15de02e064e" xlink:to="loc_us-gaap_EquitySecuritiesMember_79d33bf3-7536-4d2b-b0fb-44498f48e3a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_274ab431-4023-4818-812d-f10078ad9ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_2d825781-0d4a-43f9-8756-b15de02e064e" xlink:to="loc_us-gaap_PreferredStockMember_274ab431-4023-4818-812d-f10078ad9ba2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesRealizedGainLoss_5b690c22-2cec-4305-8dae-1c75463d7e36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_DebtSecuritiesRealizedGainLoss_5b690c22-2cec-4305-8dae-1c75463d7e36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiRealizedGainLoss_550617c5-4c12-4fc4-b6b1-cb3bca862d8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_EquitySecuritiesFvNiRealizedGainLoss_550617c5-4c12-4fc4-b6b1-cb3bca862d8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherInvestments_3e47c29e-3c13-4340-8e50-c4b2c134a86a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherInvestments_3e47c29e-3c13-4340-8e50-c4b2c134a86a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease_4d48fff0-71ed-401c-bb96-8eaf3fefda21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesPeriodIncreaseDecrease_4d48fff0-71ed-401c-bb96-8eaf3fefda21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfDerivatives_4185cc5c-b393-42c4-b92e-7a8216dd2882" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_GainLossOnSaleOfDerivatives_4185cc5c-b393-42c4-b92e-7a8216dd2882" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_caa87a88-b877-4701-aa38-c30220c2f332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_caa87a88-b877-4701-aa38-c30220c2f332" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DerivativeGainLossOnReinsuranceEmbeddedDerivativesNet_019b2ea3-7791-7229-8cc4-0f819dc13374" xlink:href="fnf-20251231.xsd#fnf_DerivativeGainLossOnReinsuranceEmbeddedDerivativesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_fnf_DerivativeGainLossOnReinsuranceEmbeddedDerivativesNet_019b2ea3-7791-7229-8cc4-0f819dc13374" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_020b5ee3-99c2-4275-a52e-f6995cff3c64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_020b5ee3-99c2-4275-a52e-f6995cff3c64" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ChangeInFairValueDerivativesIncludingOtherDerivatives_8629796a-8ea8-4a4b-b298-f19e19174bb6" xlink:href="fnf-20251231.xsd#fnf_ChangeInFairValueDerivativesIncludingOtherDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_fnf_ChangeInFairValueDerivativesIncludingOtherDerivatives_8629796a-8ea8-4a4b-b298-f19e19174bb6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_dd10d6fb-67a0-455c-8b9a-cb9a9a5d294c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_us-gaap_GainLossOnInvestments_dd10d6fb-67a0-455c-8b9a-cb9a9a5d294c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EquitySecuritiesFVNIValuationGainLoss_da67eb8e-aa5c-475a-9b40-b316ce852024" xlink:href="fnf-20251231.xsd#fnf_EquitySecuritiesFVNIValuationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_1b28a5d3-ad16-44bd-8d9d-6f2d5d085fd7" xlink:to="loc_fnf_EquitySecuritiesFVNIValuationGainLoss_da67eb8e-aa5c-475a-9b40-b316ce852024" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsVariableInterestEntitiesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsVariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsVariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c5c19-ee3a-78db-b6ca-1ad351dd644d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_us-gaap_DebtInstrumentTable_019c5c19-ee3a-78db-b6ca-1ad351dd644d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c5c19-ee3a-70f8-84da-c61b5c97302b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c5c19-ee3a-78db-b6ca-1ad351dd644d" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c5c19-ee3a-70f8-84da-c61b5c97302b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c5c19-ee3a-70f8-84da-c61b5c97302b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c5c19-ee3a-70f8-84da-c61b5c97302b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c5c19-ee3a-70f8-84da-c61b5c97302b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c5c19-ee3a-73d7-a0c8-147494e393cc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c5c19-ee3a-70f8-84da-c61b5c97302b" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c5c19-ee3a-73d7-a0c8-147494e393cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c7379-d209-7e9d-855e-26222afadb0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c5c19-ee3a-73d7-a0c8-147494e393cc" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019c7379-d209-7e9d-855e-26222afadb0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019c5c19-ee3a-7dd2-981c-d74140572e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_us-gaap_EquityMethodInvestments_019c5c19-ee3a-7dd2-981c-d74140572e9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherLoansWithinOtherLongTermInvestmentsFairValue_019c5c19-ee3a-7fdc-a1ed-f0ac0a751ed5" xlink:href="fnf-20251231.xsd#fnf_OtherLoansWithinOtherLongTermInvestmentsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_fnf_OtherLoansWithinOtherLongTermInvestmentsFairValue_019c5c19-ee3a-7fdc-a1ed-f0ac0a751ed5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019c5c19-ee3a-778f-af20-16ddacd49209" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_us-gaap_ShortTermInvestments_019c5c19-ee3a-778f-af20-16ddacd49209" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c5c19-ee3a-7130-9eb7-717639edbb05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c5c19-ee3a-7130-9eb7-717639edbb05" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c5c19-ee3a-7aad-95cb-2b0131909648" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_us-gaap_Assets_019c5c19-ee3a-7aad-95cb-2b0131909648" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNet_019c5c19-ee3a-7e84-8a6c-c44cfbf302d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c19-ee3a-7aa4-86d1-2b64d08916f1" xlink:to="loc_us-gaap_AssetsNet_019c5c19-ee3a-7e84-8a6c-c44cfbf302d3" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/InvestmentsCarryingValueandMaximumLossExposureofUnconsolidatedVIEsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#InvestmentsCarryingValueandMaximumLossExposureofUnconsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/InvestmentsCarryingValueandMaximumLossExposureofUnconsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_c2e642a8-b38c-4277-bc45-34cdef36deaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_823980ae-afad-43cd-acb2-c6f94b619bc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_c2e642a8-b38c-4277-bc45-34cdef36deaf" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_823980ae-afad-43cd-acb2-c6f94b619bc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_edc4a0c5-30b1-439c-ac35-c3c093af69df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_823980ae-afad-43cd-acb2-c6f94b619bc6" xlink:to="loc_us-gaap_InvestmentTypeAxis_edc4a0c5-30b1-439c-ac35-c3c093af69df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_edc4a0c5-30b1-439c-ac35-c3c093af69df_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_edc4a0c5-30b1-439c-ac35-c3c093af69df" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_edc4a0c5-30b1-439c-ac35-c3c093af69df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_d81c061e-0cac-4101-992a-77694a62fee3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_edc4a0c5-30b1-439c-ac35-c3c093af69df" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_d81c061e-0cac-4101-992a-77694a62fee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_019b2ea0-9d0c-7b53-a9f9-c1570570d422" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_d81c061e-0cac-4101-992a-77694a62fee3" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_019b2ea0-9d0c-7b53-a9f9-c1570570d422" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FixedMaturitySecuritiesMember_ec8a90b5-81ea-4972-aee6-4844a592410d" xlink:href="fnf-20251231.xsd#fnf_FixedMaturitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_d81c061e-0cac-4101-992a-77694a62fee3" xlink:to="loc_fnf_FixedMaturitySecuritiesMember_ec8a90b5-81ea-4972-aee6-4844a592410d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019c7755-6a37-7366-8c71-110675c93839" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_823980ae-afad-43cd-acb2-c6f94b619bc6" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019c7755-6a37-7366-8c71-110675c93839" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c7755-6a37-7366-8c71-110675c93839_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c7755-6a37-7366-8c71-110675c93839" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c7755-6a37-7366-8c71-110675c93839_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019c7755-6a37-7065-bf51-e01101bc545d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019c7755-6a37-7366-8c71-110675c93839" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019c7755-6a37-7065-bf51-e01101bc545d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019c7755-b0b1-7523-b86a-7d6c6596be30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019c7755-6a37-7065-bf51-e01101bc545d" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019c7755-b0b1-7523-b86a-7d6c6596be30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestmentsOwnedVIEUnconsolidatedCarryingValue_1c76a7cb-436f-40b5-b53c-1dc5b34c8865" xlink:href="fnf-20251231.xsd#fnf_InvestmentsOwnedVIEUnconsolidatedCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_c2e642a8-b38c-4277-bc45-34cdef36deaf" xlink:to="loc_fnf_InvestmentsOwnedVIEUnconsolidatedCarryingValue_1c76a7cb-436f-40b5-b53c-1dc5b34c8865" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_6ee108a4-fc58-47bc-b0b2-9e327918c590" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_c2e642a8-b38c-4277-bc45-34cdef36deaf" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_6ee108a4-fc58-47bc-b0b2-9e327918c590" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/DerivativeFinancialInstrumentsScheduleofCarryingAmountsofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#DerivativeFinancialInstrumentsScheduleofCarryingAmountsofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/DerivativeFinancialInstrumentsScheduleofCarryingAmountsofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019bd5c9-dce4-729f-8e59-82417cba607a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019bd5c9-dce4-7942-b90b-7917298f5ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019bd5c9-dce4-729f-8e59-82417cba607a" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019bd5c9-dce4-7942-b90b-7917298f5ffc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019bd5c9-dce4-7c8c-94bf-d4a5d216e376" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019bd5c9-dce4-7942-b90b-7917298f5ffc" xlink:to="loc_us-gaap_HedgingDesignationAxis_019bd5c9-dce4-7c8c-94bf-d4a5d216e376" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019bd5c9-dce4-7c8c-94bf-d4a5d216e376_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019bd5c9-dce4-7c8c-94bf-d4a5d216e376" xlink:to="loc_us-gaap_HedgingDesignationDomain_019bd5c9-dce4-7c8c-94bf-d4a5d216e376_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019bd5c9-dce4-7c82-9a9b-4e3d4c0eff3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019bd5c9-dce4-7c8c-94bf-d4a5d216e376" xlink:to="loc_us-gaap_HedgingDesignationDomain_019bd5c9-dce4-7c82-9a9b-4e3d4c0eff3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019bd5c9-dce4-7801-8e1c-0fde8f2f2b8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019bd5c9-dce4-7c82-9a9b-4e3d4c0eff3c" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019bd5c9-dce4-7801-8e1c-0fde8f2f2b8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019bd5c9-dce4-7e80-9479-1160d533a304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019bd5c9-dce4-7c82-9a9b-4e3d4c0eff3c" xlink:to="loc_us-gaap_NondesignatedMember_019bd5c9-dce4-7e80-9479-1160d533a304" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5c9-dce4-7027-a002-d8d0d80d1f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019bd5c9-dce4-7942-b90b-7917298f5ffc" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5c9-dce4-7027-a002-d8d0d80d1f7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7027-a002-d8d0d80d1f7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5c9-dce4-7027-a002-d8d0d80d1f7c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7027-a002-d8d0d80d1f7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5c9-dce4-7027-a002-d8d0d80d1f7c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019bd5c9-dce4-7c00-9d53-83cb18e45d5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_us-gaap_InterestRateSwapMember_019bd5c9-dce4-7c00-9d53-83cb18e45d5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ForeignCurrencySwapsAndOtherDerivativesMember_019bd5c9-dce4-7a99-a00c-bb06d2a54e5b" xlink:href="fnf-20251231.xsd#fnf_ForeignCurrencySwapsAndOtherDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_fnf_ForeignCurrencySwapsAndOtherDerivativesMember_019bd5c9-dce4-7a99-a00c-bb06d2a54e5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019bd5c9-dce4-75bf-b023-cdb7ed84075f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_us-gaap_StockOptionMember_019bd5c9-dce4-75bf-b023-cdb7ed84075f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019bd5c9-dce4-7e8a-b792-61f9a16540c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_us-gaap_FutureMember_019bd5c9-dce4-7e8a-b792-61f9a16540c4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherDerivativeInvestmentsMember_019bd5c9-dce4-7b87-a3e5-1ade9eebf338" xlink:href="fnf-20251231.xsd#fnf_OtherDerivativeInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_fnf_OtherDerivativeInvestmentsMember_019bd5c9-dce4-7b87-a3e5-1ade9eebf338" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019bd5c9-dce4-75c8-9cab-4878126f2bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019bd5c9-dce4-75c8-9cab-4878126f2bb0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019bd5c9-dce4-7255-85f1-e15e913ef694" xlink:href="fnf-20251231.xsd#fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_fnf_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019bd5c9-dce4-7255-85f1-e15e913ef694" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EmbeddedDerivativesInReinsuranceContractsMember_019bd5c9-dce4-7b4b-aa43-5c227e00d709" xlink:href="fnf-20251231.xsd#fnf_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5c9-dce4-7d97-bf99-914db75512c1" xlink:to="loc_fnf_EmbeddedDerivativesInReinsuranceContractsMember_019bd5c9-dce4-7b4b-aa43-5c227e00d709" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019bd5c9-dce4-7d93-9627-50426cc491ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019bd5c9-dce4-729f-8e59-82417cba607a" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019bd5c9-dce4-7d93-9627-50426cc491ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019bd5c9-dce4-7256-8a24-d1e0b5371cf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019bd5c9-dce4-729f-8e59-82417cba607a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019bd5c9-dce4-7256-8a24-d1e0b5371cf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019bd5c9-dce4-7d97-a1a5-3c28f61836fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019bd5c9-dce4-729f-8e59-82417cba607a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019bd5c9-dce4-7d97-a1a5-3c28f61836fd" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/DerivativeFinancialInstrumentsScheduleofChangeinFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#DerivativeFinancialInstrumentsScheduleofChangeinFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/DerivativeFinancialInstrumentsScheduleofChangeinFairValueofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019bd5cf-c267-761d-b47f-db8c58e5c7b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019bd5cf-c267-738c-b72c-09767839f6ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5cf-c267-761d-b47f-db8c58e5c7b3" xlink:to="loc_us-gaap_DerivativeTable_019bd5cf-c267-738c-b72c-09767839f6ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5cf-c267-7760-90c9-7f238749ed1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019bd5cf-c267-738c-b72c-09767839f6ef" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5cf-c267-7760-90c9-7f238749ed1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-7760-90c9-7f238749ed1d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5cf-c267-7760-90c9-7f238749ed1d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-7760-90c9-7f238749ed1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5cf-c267-7760-90c9-7f238749ed1d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019bd5cf-c267-78fd-8659-393de84c9341" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_us-gaap_InterestRateSwapMember_019bd5cf-c267-78fd-8659-393de84c9341" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ForeignCurrencySwapsAndOtherDerivativesMember_019bd5cf-c267-7911-a088-cd57fe70ba87" xlink:href="fnf-20251231.xsd#fnf_ForeignCurrencySwapsAndOtherDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_fnf_ForeignCurrencySwapsAndOtherDerivativesMember_019bd5cf-c267-7911-a088-cd57fe70ba87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019bd5cf-c267-7893-8525-fdeb9a67c282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_us-gaap_StockOptionMember_019bd5cf-c267-7893-8525-fdeb9a67c282" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019bd5cf-c267-73a8-a7b0-47bc9632399a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_us-gaap_FutureMember_019bd5cf-c267-73a8-a7b0-47bc9632399a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherDerivativeInvestmentsMember_019bd5cf-c267-7358-b384-640889d73f86" xlink:href="fnf-20251231.xsd#fnf_OtherDerivativeInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_fnf_OtherDerivativeInvestmentsMember_019bd5cf-c267-7358-b384-640889d73f86" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019bd5cf-c267-7ffe-a0c3-5646199d199c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019bd5cf-c267-7ffe-a0c3-5646199d199c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FixedAnnuityIULEmbeddedDerivativesMember_019bd5cf-c267-78da-be53-0878e96aa15a" xlink:href="fnf-20251231.xsd#fnf_FixedAnnuityIULEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_fnf_FixedAnnuityIULEmbeddedDerivativesMember_019bd5cf-c267-78da-be53-0878e96aa15a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EmbeddedDerivativesInReinsuranceContractsMember_019bd5cf-c267-73d4-bb14-d1da4aeb23ac" xlink:href="fnf-20251231.xsd#fnf_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5cf-c267-72b3-8950-b985f22ffae4" xlink:to="loc_fnf_EmbeddedDerivativesInReinsuranceContractsMember_019bd5cf-c267-73d4-bb14-d1da4aeb23ac" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019bd5cf-c267-7bae-9676-3fd9bbc8a4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019bd5cf-c267-738c-b72c-09767839f6ef" xlink:to="loc_us-gaap_HedgingDesignationAxis_019bd5cf-c267-7bae-9676-3fd9bbc8a4b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019bd5cf-c267-7bae-9676-3fd9bbc8a4b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019bd5cf-c267-7bae-9676-3fd9bbc8a4b9" xlink:to="loc_us-gaap_HedgingDesignationDomain_019bd5cf-c267-7bae-9676-3fd9bbc8a4b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019bd5cf-c267-7ab0-9993-58ab45e44c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019bd5cf-c267-7bae-9676-3fd9bbc8a4b9" xlink:to="loc_us-gaap_HedgingDesignationDomain_019bd5cf-c267-7ab0-9993-58ab45e44c4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019bd5cf-c267-7197-b217-73983d9965e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019bd5cf-c267-7ab0-9993-58ab45e44c4e" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019bd5cf-c267-7197-b217-73983d9965e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019bd5cf-c267-7b88-888b-99ad0b296d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019bd5cf-c267-7ab0-9993-58ab45e44c4e" xlink:to="loc_us-gaap_NondesignatedMember_019bd5cf-c267-7b88-888b-99ad0b296d8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019bd5cf-c267-747a-90ed-dcbb581d4d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019bd5cf-c267-738c-b72c-09767839f6ef" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019bd5cf-c267-747a-90ed-dcbb581d4d09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019bd5cf-c267-747a-90ed-dcbb581d4d09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019bd5cf-c267-747a-90ed-dcbb581d4d09" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019bd5cf-c267-747a-90ed-dcbb581d4d09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019bd5cf-c267-72bf-b3ea-2f2dfd519608" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019bd5cf-c267-747a-90ed-dcbb581d4d09" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019bd5cf-c267-72bf-b3ea-2f2dfd519608" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019bd5cf-c267-7954-a677-c0d269f63f3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019bd5cf-c267-72bf-b3ea-2f2dfd519608" xlink:to="loc_us-gaap_FairValueHedgingMember_019bd5cf-c267-7954-a677-c0d269f63f3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019bd5cf-c267-70fb-9b22-8cfc67b299e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5cf-c267-761d-b47f-db8c58e5c7b3" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019bd5cf-c267-70fb-9b22-8cfc67b299e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_019bd5cf-c267-7d95-b329-9457aac9484d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5cf-c267-761d-b47f-db8c58e5c7b3" xlink:to="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_019bd5cf-c267-7d95-b329-9457aac9484d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019bd5cf-c267-7a18-89b2-99cd1fc3438b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5cf-c267-761d-b47f-db8c58e5c7b3" xlink:to="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019bd5cf-c267-7a18-89b2-99cd1fc3438b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#DerivativeFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_f3d763e6-43b8-46fc-95f1-0f9f6b9363f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_DerivativeTable_f3d763e6-43b8-46fc-95f1-0f9f6b9363f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019bd5db-fe6d-78f3-aaa0-51749c8639e7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f3d763e6-43b8-46fc-95f1-0f9f6b9363f2" xlink:to="loc_srt_CounterpartyNameAxis_019bd5db-fe6d-78f3-aaa0-51749c8639e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019bd5db-fe6d-78f3-aaa0-51749c8639e7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019bd5db-fe6d-78f3-aaa0-51749c8639e7" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019bd5db-fe6d-78f3-aaa0-51749c8639e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019bd5db-fe6d-7a2c-94f5-aa22015d6f6a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019bd5db-fe6d-78f3-aaa0-51749c8639e7" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019bd5db-fe6d-7a2c-94f5-aa22015d6f6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AllCounterpartiesExceptOneMember_019bd5db-fe6d-7eff-8644-3650cb69491e" xlink:href="fnf-20251231.xsd#fnf_AllCounterpartiesExceptOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019bd5db-fe6d-7a2c-94f5-aa22015d6f6a" xlink:to="loc_fnf_AllCounterpartiesExceptOneMember_019bd5db-fe6d-7eff-8644-3650cb69491e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019bd5db-fe6d-7ff8-a0c8-7ff9d8f42acd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f3d763e6-43b8-46fc-95f1-0f9f6b9363f2" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019bd5db-fe6d-7ff8-a0c8-7ff9d8f42acd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019bd5db-fe6d-7ff8-a0c8-7ff9d8f42acd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019bd5db-fe6d-7ff8-a0c8-7ff9d8f42acd" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019bd5db-fe6d-7ff8-a0c8-7ff9d8f42acd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019bd5db-fe6d-7bd5-94eb-b2d5c531e284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019bd5db-fe6d-7ff8-a0c8-7ff9d8f42acd" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019bd5db-fe6d-7bd5-94eb-b2d5c531e284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DerivativesForTradingAndInvestmentMember_019bd5db-fe6d-7223-ba49-34bd36b5d57b" xlink:href="fnf-20251231.xsd#fnf_DerivativesForTradingAndInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019bd5db-fe6d-7bd5-94eb-b2d5c531e284" xlink:to="loc_fnf_DerivativesForTradingAndInvestmentMember_019bd5db-fe6d-7223-ba49-34bd36b5d57b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_019bd5db-fe6d-74e6-bd26-90498fa64741" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019bd5db-fe6d-7bd5-94eb-b2d5c531e284" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_019bd5db-fe6d-74e6-bd26-90498fa64741" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5db-fe6d-793b-a4bb-efd7738714bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f3d763e6-43b8-46fc-95f1-0f9f6b9363f2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5db-fe6d-793b-a4bb-efd7738714bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-793b-a4bb-efd7738714bb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5db-fe6d-793b-a4bb-efd7738714bb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-793b-a4bb-efd7738714bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-7474-aa04-149ad229b462" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019bd5db-fe6d-793b-a4bb-efd7738714bb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-7474-aa04-149ad229b462" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CallOptionsAndInterestRateSwapsMember_019bd5db-fe6d-766b-8c63-5ab0ef0f6525" xlink:href="fnf-20251231.xsd#fnf_CallOptionsAndInterestRateSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-7474-aa04-149ad229b462" xlink:to="loc_fnf_CallOptionsAndInterestRateSwapsMember_019bd5db-fe6d-766b-8c63-5ab0ef0f6525" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019bd5dc-22ae-7d53-b6a9-dd02e0740151" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-7474-aa04-149ad229b462" xlink:to="loc_us-gaap_FutureMember_019bd5dc-22ae-7d53-b6a9-dd02e0740151" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CallOptionMember_019c67e5-ad03-7fa4-abd8-f9693a07f993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CallOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019bd5db-fe6d-7474-aa04-149ad229b462" xlink:to="loc_us-gaap_CallOptionMember_019c67e5-ad03-7fa4-abd8-f9693a07f993" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019bd5db-fe6d-787c-8fcf-f4c9c668d10b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_f3d763e6-43b8-46fc-95f1-0f9f6b9363f2" xlink:to="loc_us-gaap_HedgingDesignationAxis_019bd5db-fe6d-787c-8fcf-f4c9c668d10b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019bd5db-fe6d-787c-8fcf-f4c9c668d10b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019bd5db-fe6d-787c-8fcf-f4c9c668d10b" xlink:to="loc_us-gaap_HedgingDesignationDomain_019bd5db-fe6d-787c-8fcf-f4c9c668d10b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019bd5db-fe6d-7cea-a0a1-c3f6f3babb6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019bd5db-fe6d-787c-8fcf-f4c9c668d10b" xlink:to="loc_us-gaap_HedgingDesignationDomain_019bd5db-fe6d-7cea-a0a1-c3f6f3babb6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019bd5db-fe6d-7b0d-9d89-43867f4c4373" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019bd5db-fe6d-7cea-a0a1-c3f6f3babb6b" xlink:to="loc_us-gaap_NondesignatedMember_019bd5db-fe6d-7b0d-9d89-43867f4c4373" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019bd5db-b027-7f30-a298-ff45be7815ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019bd5db-b027-7f30-a298-ff45be7815ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019bd5db-b027-719c-8a4c-edea22bcf2c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019bd5db-b027-719c-8a4c-edea22bcf2c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NumberOfCounterpartiesNetExposureThresholdNotSetToZero_019bd5db-fe6d-73e0-92c6-8d063c554891" xlink:href="fnf-20251231.xsd#fnf_NumberOfCounterpartiesNetExposureThresholdNotSetToZero"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_fnf_NumberOfCounterpartiesNetExposureThresholdNotSetToZero_019bd5db-fe6d-73e0-92c6-8d063c554891" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DerivativesCollateralNetExposureThresholdForWhichCollateralRequired_019bd5db-fe6d-7574-80ff-5f5aa1a98bcb" xlink:href="fnf-20251231.xsd#fnf_DerivativesCollateralNetExposureThresholdForWhichCollateralRequired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_fnf_DerivativesCollateralNetExposureThresholdForWhichCollateralRequired_019bd5db-fe6d-7574-80ff-5f5aa1a98bcb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019bd5db-fe6d-7dc3-acde-5c0f94ed4dc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019bd5db-fe6d-7dc3-acde-5c0f94ed4dc0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019bd5db-fe6d-75f0-b36d-720b297941ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019bd5db-fe6d-75f0-b36d-720b297941ca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019bd5dc-22ae-709e-b4ac-898036d71ac2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019bd5dc-22ae-709e-b4ac-898036d71ac2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_019bd5dc-22ae-797b-9874-f8088c0cf294" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralAlreadyPostedAggregateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019bd5db-b027-7534-bb45-d415c7418884" xlink:to="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_019bd5dc-22ae-797b-9874-f8088c0cf294" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/DerivativeFinancialInstrumentsScheduleofExposuretoCreditLossonCallOptionsHeldDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#DerivativeFinancialInstrumentsScheduleofExposuretoCreditLossonCallOptionsHeldDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/DerivativeFinancialInstrumentsScheduleofExposuretoCreditLossonCallOptionsHeldDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_da294e35-e245-4762-940c-07e9f8a763e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_f825cf4e-45e5-4a65-bc69-971e72e4da1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da294e35-e245-4762-940c-07e9f8a763e8" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_f825cf4e-45e5-4a65-bc69-971e72e4da1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_e01d1c4d-2ed3-4852-be06-700e847245ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_f825cf4e-45e5-4a65-bc69-971e72e4da1c" xlink:to="loc_us-gaap_HedgingDesignationAxis_e01d1c4d-2ed3-4852-be06-700e847245ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_e01d1c4d-2ed3-4852-be06-700e847245ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_e01d1c4d-2ed3-4852-be06-700e847245ac" xlink:to="loc_us-gaap_HedgingDesignationDomain_e01d1c4d-2ed3-4852-be06-700e847245ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_91edb8f3-cdc0-4440-8b71-c269aeea8b8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_e01d1c4d-2ed3-4852-be06-700e847245ac" xlink:to="loc_us-gaap_HedgingDesignationDomain_91edb8f3-cdc0-4440-8b71-c269aeea8b8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_4fc63566-3edd-48d1-8c39-0536f9160a12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_91edb8f3-cdc0-4440-8b71-c269aeea8b8a" xlink:to="loc_us-gaap_NondesignatedMember_4fc63566-3edd-48d1-8c39-0536f9160a12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_72b076a6-b824-4368-aa6c-75ea3f413eeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_f825cf4e-45e5-4a65-bc69-971e72e4da1c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_72b076a6-b824-4368-aa6c-75ea3f413eeb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_72b076a6-b824-4368-aa6c-75ea3f413eeb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_72b076a6-b824-4368-aa6c-75ea3f413eeb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_72b076a6-b824-4368-aa6c-75ea3f413eeb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_a417b68e-d299-451b-b8f7-d8f8903af56d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_72b076a6-b824-4368-aa6c-75ea3f413eeb" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_a417b68e-d299-451b-b8f7-d8f8903af56d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DerivativeInstrumentsExcludingFuturesContractMember_2ecd3b13-35f8-4e3c-9062-f180493dd81d" xlink:href="fnf-20251231.xsd#fnf_DerivativeInstrumentsExcludingFuturesContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_a417b68e-d299-451b-b8f7-d8f8903af56d" xlink:to="loc_fnf_DerivativeInstrumentsExcludingFuturesContractMember_2ecd3b13-35f8-4e3c-9062-f180493dd81d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_4ab88f5b-5bb8-46aa-b6ef-dcc758a6890f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da294e35-e245-4762-940c-07e9f8a763e8" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_4ab88f5b-5bb8-46aa-b6ef-dcc758a6890f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_9d0f01e1-089f-4e11-bd4c-9df1fd72fdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da294e35-e245-4762-940c-07e9f8a763e8" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_9d0f01e1-089f-4e11-bd4c-9df1fd72fdfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_923d697b-6e9f-45f8-af1e-1ae218258b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da294e35-e245-4762-940c-07e9f8a763e8" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_923d697b-6e9f-45f8-af1e-1ae218258b5e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/NotesPayableScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#NotesPayableScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/NotesPayableScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_245ed02f-060c-4adb-92bc-83357f3cb1d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c204c2fe-4492-4907-9887-44584eaa3185" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_245ed02f-060c-4adb-92bc-83357f3cb1d9" xlink:to="loc_us-gaap_DebtInstrumentTable_c204c2fe-4492-4907-9887-44584eaa3185" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f2f8a364-686a-4fbb-9455-769d8b698aab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c204c2fe-4492-4907-9887-44584eaa3185" xlink:to="loc_us-gaap_DebtInstrumentAxis_f2f8a364-686a-4fbb-9455-769d8b698aab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f2f8a364-686a-4fbb-9455-769d8b698aab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_f2f8a364-686a-4fbb-9455-769d8b698aab" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f2f8a364-686a-4fbb-9455-769d8b698aab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_f2f8a364-686a-4fbb-9455-769d8b698aab" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FourPointFiveZeroPercentUnsecuredNotesDueAugust2028Member_534f3d71-7f7c-41ef-9591-dc27dcfadb25" xlink:href="fnf-20251231.xsd#fnf_FourPointFiveZeroPercentUnsecuredNotesDueAugust2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_FourPointFiveZeroPercentUnsecuredNotesDueAugust2028Member_534f3d71-7f7c-41ef-9591-dc27dcfadb25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ThreePointFourZeroPercentUnsecuredNotesDueSeptember2022Member_a98af6d3-6be9-42fd-bde7-f12b0a5070e0" xlink:href="fnf-20251231.xsd#fnf_ThreePointFourZeroPercentUnsecuredNotesDueSeptember2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_ThreePointFourZeroPercentUnsecuredNotesDueSeptember2022Member_a98af6d3-6be9-42fd-bde7-f12b0a5070e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A245SeniorNotesDueMarch2031Member_f808fdd0-59e6-4ed9-b83a-e344ab3ced94" xlink:href="fnf-20251231.xsd#fnf_A245SeniorNotesDueMarch2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A245SeniorNotesDueMarch2031Member_f808fdd0-59e6-4ed9-b83a-e344ab3ced94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A3.20SeniorNotesDue2051Member_f561ce64-de28-4164-aa7a-09d752991206" xlink:href="fnf-20251231.xsd#fnf_A3.20SeniorNotesDue2051Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A3.20SeniorNotesDue2051Member_f561ce64-de28-4164-aa7a-09d752991206" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RevolvingCreditFacilityDueOctober2025Member_019b7174-e06c-770f-8cc7-5c80c49b5a3f" xlink:href="fnf-20251231.xsd#fnf_RevolvingCreditFacilityDueOctober2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_RevolvingCreditFacilityDueOctober2025Member_019b7174-e06c-770f-8cc7-5c80c49b5a3f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGCreditAgreementMember_8e0aaeb3-0e9a-445e-83a3-948a0c29643c" xlink:href="fnf-20251231.xsd#fnf_FGCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_FGCreditAgreementMember_8e0aaeb3-0e9a-445e-83a3-948a0c29643c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A550FGNotesMember_90527041-d8c1-4622-b775-8d7b389333cc" xlink:href="fnf-20251231.xsd#fnf_A550FGNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A550FGNotesMember_90527041-d8c1-4622-b775-8d7b389333cc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A740SeniorNotesDue2028Member_44167af1-281d-489d-ab52-0b56f5834f40" xlink:href="fnf-20251231.xsd#fnf_A740SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A740SeniorNotesDue2028Member_44167af1-281d-489d-ab52-0b56f5834f40" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A7.30FGNotesMember_019c5c31-4437-712e-832b-c13fc99814a4" xlink:href="fnf-20251231.xsd#fnf_A7.30FGNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A7.30FGNotesMember_019c5c31-4437-712e-832b-c13fc99814a4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A795SeniorNotesDue2053Member_546c5f74-314b-4389-8c8c-83acf8c5425a" xlink:href="fnf-20251231.xsd#fnf_A795SeniorNotesDue2053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A795SeniorNotesDue2053Member_546c5f74-314b-4389-8c8c-83acf8c5425a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A6.50SeniorNotesDue2029Member_bbc68528-a351-49aa-bc04-c909d830cd67" xlink:href="fnf-20251231.xsd#fnf_A6.50SeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A6.50SeniorNotesDue2029Member_bbc68528-a351-49aa-bc04-c909d830cd67" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A6.250SeniorNotesDue2034Member_3d153b93-0c30-4d2b-9eda-e3a1b8316d13" xlink:href="fnf-20251231.xsd#fnf_A6.250SeniorNotesDue2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_A6.250SeniorNotesDue2034Member_3d153b93-0c30-4d2b-9eda-e3a1b8316d13" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherLongTermDebtMember_999b8c65-e21a-498e-a119-3ac6448d9c0a" xlink:href="fnf-20251231.xsd#fnf_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_0301cd6f-6c47-4bf0-b08d-cc47af15c545" xlink:to="loc_fnf_OtherLongTermDebtMember_999b8c65-e21a-498e-a119-3ac6448d9c0a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_5c6729d6-2d36-4c33-b164-675d3a3b78f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c204c2fe-4492-4907-9887-44584eaa3185" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_5c6729d6-2d36-4c33-b164-675d3a3b78f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5c6729d6-2d36-4c33-b164-675d3a3b78f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5c6729d6-2d36-4c33-b164-675d3a3b78f9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5c6729d6-2d36-4c33-b164-675d3a3b78f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_99097670-67c5-4f9d-bcd3-7439c6a8aadf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_5c6729d6-2d36-4c33-b164-675d3a3b78f9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_99097670-67c5-4f9d-bcd3-7439c6a8aadf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_8da32f1e-eded-4a3e-a9f0-28315beedd9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_99097670-67c5-4f9d-bcd3-7439c6a8aadf" xlink:to="loc_us-gaap_SeniorNotesMember_8da32f1e-eded-4a3e-a9f0-28315beedd9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_33f68f9f-fb07-46b9-9278-4a00cd824aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_99097670-67c5-4f9d-bcd3-7439c6a8aadf" xlink:to="loc_us-gaap_LineOfCreditMember_33f68f9f-fb07-46b9-9278-4a00cd824aa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_87e56ffe-d8ff-4d7a-a0da-8d063c1ff3cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c204c2fe-4492-4907-9887-44584eaa3185" xlink:to="loc_us-gaap_CreditFacilityAxis_87e56ffe-d8ff-4d7a-a0da-8d063c1ff3cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_87e56ffe-d8ff-4d7a-a0da-8d063c1ff3cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_87e56ffe-d8ff-4d7a-a0da-8d063c1ff3cc" xlink:to="loc_us-gaap_CreditFacilityDomain_87e56ffe-d8ff-4d7a-a0da-8d063c1ff3cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_219cba11-38ef-420b-b2eb-a734f261388d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_87e56ffe-d8ff-4d7a-a0da-8d063c1ff3cc" xlink:to="loc_us-gaap_CreditFacilityDomain_219cba11-38ef-420b-b2eb-a734f261388d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_dd9a35b5-9a83-4bce-bb40-fb667478bab9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_219cba11-38ef-420b-b2eb-a734f261388d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_dd9a35b5-9a83-4bce-bb40-fb667478bab9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8eab772f-2d2b-4d8b-9539-788c0f0eb067" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_245ed02f-060c-4adb-92bc-83357f3cb1d9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8eab772f-2d2b-4d8b-9539-788c0f0eb067" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_74046119-51fd-4af8-b894-d5af08aaf45c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_245ed02f-060c-4adb-92bc-83357f3cb1d9" xlink:to="loc_us-gaap_LongTermDebt_74046119-51fd-4af8-b894-d5af08aaf45c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LongTermDebtNet_019b716f-f91e-70d3-8ff6-e028f85bc902" xlink:href="fnf-20251231.xsd#fnf_LongTermDebtNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_245ed02f-060c-4adb-92bc-83357f3cb1d9" xlink:to="loc_fnf_LongTermDebtNet_019b716f-f91e-70d3-8ff6-e028f85bc902" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/NotesPayableNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#NotesPayableNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/NotesPayableNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c5c48-5371-7161-a47f-d33dbbda7c03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c5c48-5371-7161-a47f-d33dbbda7c03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7161-a47f-d33dbbda7c03_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c5c48-5371-7161-a47f-d33dbbda7c03" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7161-a47f-d33dbbda7c03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c5c48-5371-7161-a47f-d33dbbda7c03" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A7.300JuniorSubordinatedNotesDue2065Member_019c5c48-5371-7646-92b3-3e8ce1a1e209" xlink:href="fnf-20251231.xsd#fnf_A7.300JuniorSubordinatedNotesDue2065Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A7.300JuniorSubordinatedNotesDue2065Member_019c5c48-5371-7646-92b3-3e8ce1a1e209" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A5.50FGSeniorNotesDueMay2025Member_019c5c48-5371-7a6d-8c48-d8b5909da501" xlink:href="fnf-20251231.xsd#fnf_A5.50FGSeniorNotesDueMay2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A5.50FGSeniorNotesDueMay2025Member_019c5c48-5371-7a6d-8c48-d8b5909da501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A6.250SeniorNotesDue2034Member_019c5c48-5371-727e-9a8e-2b1c05deae54" xlink:href="fnf-20251231.xsd#fnf_A6.250SeniorNotesDue2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A6.250SeniorNotesDue2034Member_019c5c48-5371-727e-9a8e-2b1c05deae54" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CreditAgreementNovember2022Member_019c5c48-5371-7dc9-bd31-e9bdb5fb373b" xlink:href="fnf-20251231.xsd#fnf_CreditAgreementNovember2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_CreditAgreementNovember2022Member_019c5c48-5371-7dc9-bd31-e9bdb5fb373b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A6.50SeniorNotesDue2029Member_019c5c48-5371-75ee-884e-6b4f261e8ade" xlink:href="fnf-20251231.xsd#fnf_A6.50SeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A6.50SeniorNotesDue2029Member_019c5c48-5371-75ee-884e-6b4f261e8ade" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A795SeniorNotesDue2053Member_019c5c48-ae73-7e21-896f-5f6e03dfe7c2" xlink:href="fnf-20251231.xsd#fnf_A795SeniorNotesDue2053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A795SeniorNotesDue2053Member_019c5c48-ae73-7e21-896f-5f6e03dfe7c2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A740SeniorNotesDue2028Member_019c5c48-ae73-7867-b67c-f013a2f856aa" xlink:href="fnf-20251231.xsd#fnf_A740SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A740SeniorNotesDue2028Member_019c5c48-ae73-7867-b67c-f013a2f856aa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGCreditAgreementMember_019c5c48-ae73-7290-aeb9-46eb068a090a" xlink:href="fnf-20251231.xsd#fnf_FGCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_FGCreditAgreementMember_019c5c48-ae73-7290-aeb9-46eb068a090a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A3.20SeniorNotesDue2051Member_019c5c49-2c5d-7e86-adb3-74fd99115921" xlink:href="fnf-20251231.xsd#fnf_A3.20SeniorNotesDue2051Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A3.20SeniorNotesDue2051Member_019c5c49-2c5d-7e86-adb3-74fd99115921" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RevolvingCreditFacilityDueOctober2025Member_019c5c49-2c5d-7887-931c-3ac55cbe7c03" xlink:href="fnf-20251231.xsd#fnf_RevolvingCreditFacilityDueOctober2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_RevolvingCreditFacilityDueOctober2025Member_019c5c49-2c5d-7887-931c-3ac55cbe7c03" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A245SeniorNotesDueMarch2031Member_019c5c49-2c5d-7ce6-bcf1-28c84e6ab402" xlink:href="fnf-20251231.xsd#fnf_A245SeniorNotesDueMarch2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A245SeniorNotesDueMarch2031Member_019c5c49-2c5d-7ce6-bcf1-28c84e6ab402" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TermLoanCreditAgreementMember_019c5c49-2c5d-7e15-a435-272151c1c71e" xlink:href="fnf-20251231.xsd#fnf_TermLoanCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_TermLoanCreditAgreementMember_019c5c49-2c5d-7e15-a435-272151c1c71e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A340NotesDueJune152030Member_019c5c49-2c5d-7b33-8096-d27685877656" xlink:href="fnf-20251231.xsd#fnf_A340NotesDueJune152030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A340NotesDueJune152030Member_019c5c49-2c5d-7b33-8096-d27685877656" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A4.50NotesDueAugust2028Member_019c5c49-2c5d-7a82-8aef-45d0988bd42a" xlink:href="fnf-20251231.xsd#fnf_A4.50NotesDueAugust2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c5c48-5371-7f47-a8b8-ad3abb2aaa47" xlink:to="loc_fnf_A4.50NotesDueAugust2028Member_019c5c49-2c5d-7a82-8aef-45d0988bd42a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c5c48-5371-71e8-9a81-6a89cd09decf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c5c48-5371-71e8-9a81-6a89cd09decf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-71e8-9a81-6a89cd09decf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c5c48-5371-71e8-9a81-6a89cd09decf" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-71e8-9a81-6a89cd09decf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-79b5-9717-5e2b8091245f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c5c48-5371-71e8-9a81-6a89cd09decf" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-79b5-9717-5e2b8091245f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019c5c48-5371-76d6-bd30-f76f28a6b26a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-79b5-9717-5e2b8091245f" xlink:to="loc_us-gaap_SeniorNotesMember_019c5c48-5371-76d6-bd30-f76f28a6b26a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019c5c48-5371-7c24-97be-3ccdda7fbd48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-79b5-9717-5e2b8091245f" xlink:to="loc_us-gaap_LineOfCreditMember_019c5c48-5371-7c24-97be-3ccdda7fbd48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TermLoanMember_019c5c49-2c5d-7fd1-8f47-ff40cc9879be" xlink:href="fnf-20251231.xsd#fnf_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c5c48-5371-79b5-9717-5e2b8091245f" xlink:to="loc_fnf_TermLoanMember_019c5c49-2c5d-7fd1-8f47-ff40cc9879be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c5c48-5371-7da0-86cf-f1f829d0f82e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:to="loc_us-gaap_CreditFacilityAxis_019c5c48-5371-7da0-86cf-f1f829d0f82e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c5c48-5371-7da0-86cf-f1f829d0f82e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c5c48-5371-7da0-86cf-f1f829d0f82e" xlink:to="loc_us-gaap_CreditFacilityDomain_019c5c48-5371-7da0-86cf-f1f829d0f82e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c5c48-5371-741e-9abe-30a7f343087b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c5c48-5371-7da0-86cf-f1f829d0f82e" xlink:to="loc_us-gaap_CreditFacilityDomain_019c5c48-5371-741e-9abe-30a7f343087b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019c5c48-5371-7dd4-92b4-dac1512821fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c5c48-5371-741e-9abe-30a7f343087b" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019c5c48-5371-7dd4-92b4-dac1512821fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtInterestRateConditionsAxis_019c5c48-ae73-7b46-96d3-485277ce218c" xlink:href="fnf-20251231.xsd#fnf_DebtInterestRateConditionsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:to="loc_fnf_DebtInterestRateConditionsAxis_019c5c48-ae73-7b46-96d3-485277ce218c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtInterestRateConditionsDomain_019c5c48-ae73-7b46-96d3-485277ce218c_default" xlink:href="fnf-20251231.xsd#fnf_DebtInterestRateConditionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fnf_DebtInterestRateConditionsAxis_019c5c48-ae73-7b46-96d3-485277ce218c" xlink:to="loc_fnf_DebtInterestRateConditionsDomain_019c5c48-ae73-7b46-96d3-485277ce218c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtInterestRateConditionsDomain_019c5c48-ae73-7371-90bf-580f06e7b156" xlink:href="fnf-20251231.xsd#fnf_DebtInterestRateConditionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fnf_DebtInterestRateConditionsAxis_019c5c48-ae73-7b46-96d3-485277ce218c" xlink:to="loc_fnf_DebtInterestRateConditionsDomain_019c5c48-ae73-7371-90bf-580f06e7b156" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtTermsConditionOneMember_019c5c48-ae73-7ab4-9a12-7c4c08bfa392" xlink:href="fnf-20251231.xsd#fnf_DebtTermsConditionOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtInterestRateConditionsDomain_019c5c48-ae73-7371-90bf-580f06e7b156" xlink:to="loc_fnf_DebtTermsConditionOneMember_019c5c48-ae73-7ab4-9a12-7c4c08bfa392" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtTermsConditionTwoMember_019c5c48-ae73-7a1b-ae5a-a358ecda5ac3" xlink:href="fnf-20251231.xsd#fnf_DebtTermsConditionTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DebtInterestRateConditionsDomain_019c5c48-ae73-7371-90bf-580f06e7b156" xlink:to="loc_fnf_DebtTermsConditionTwoMember_019c5c48-ae73-7a1b-ae5a-a358ecda5ac3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c5c48-ae73-7700-a6f0-0da5a048c30d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_dbc4d04d-4e48-482f-a314-7d8de00ef607" xlink:to="loc_srt_RangeAxis_019c5c48-ae73-7700-a6f0-0da5a048c30d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c5c48-ae73-7700-a6f0-0da5a048c30d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c5c48-ae73-7700-a6f0-0da5a048c30d" xlink:to="loc_srt_RangeMember_019c5c48-ae73-7700-a6f0-0da5a048c30d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c5c48-ae73-7534-940b-7bfcfbb9d8c3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c5c48-ae73-7700-a6f0-0da5a048c30d" xlink:to="loc_srt_RangeMember_019c5c48-ae73-7534-940b-7bfcfbb9d8c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c5c48-ae73-7289-8411-5d73b90f8c91" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c5c48-ae73-7534-940b-7bfcfbb9d8c3" xlink:to="loc_srt_MinimumMember_019c5c48-ae73-7289-8411-5d73b90f8c91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c5c48-ae73-7365-9ce0-bc55884380b6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c5c48-ae73-7534-940b-7bfcfbb9d8c3" xlink:to="loc_srt_MaximumMember_019c5c48-ae73-7365-9ce0-bc55884380b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c5c48-5371-7736-a896-594ccb3457a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019c5c48-5371-7736-a896-594ccb3457a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019c5c48-5371-7392-a3cb-b02ee4bfa404" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019c5c48-5371-7392-a3cb-b02ee4bfa404" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019c5c48-5371-792a-a76e-774156bf8d92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019c5c48-5371-792a-a76e-774156bf8d92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PriceAsPercentOfParOnOfferingOfUnsecuredNotes_019c5c48-5371-75b2-b164-28656b7721dd" xlink:href="fnf-20251231.xsd#fnf_PriceAsPercentOfParOnOfferingOfUnsecuredNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_fnf_PriceAsPercentOfParOnOfferingOfUnsecuredNotes_019c5c48-5371-75b2-b164-28656b7721dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019c5c48-5371-7cd4-b072-28fdd06385cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019c5c48-5371-7cd4-b072-28fdd06385cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_019c5c48-5371-77f2-a749-30e510fd75ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_019c5c48-5371-77f2-a749-30e510fd75ca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_019c5c48-5371-7e6d-a1fe-255215eca83c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_019c5c48-5371-7e6d-a1fe-255215eca83c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_019c5c48-ae73-7cf3-ad77-1d6346b6ccec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_019c5c48-ae73-7cf3-ad77-1d6346b6ccec" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedPremium_019c5c48-ae73-7f82-aed2-77cc70601aa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedPremium_019c5c48-ae73-7f82-aed2-77cc70601aa4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c5c48-ae73-74b1-a3a1-f4e98345a83f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c5c48-ae73-74b1-a3a1-f4e98345a83f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease_019c5c48-ae73-72ba-9cd5-f72c1cea3d8d" xlink:href="fnf-20251231.xsd#fnf_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_fnf_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease_019c5c48-ae73-72ba-9cd5-f72c1cea3d8d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019c5c48-ae73-7d5e-a23d-83d8064aec78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019c5c48-ae73-7d5e-a23d-83d8064aec78" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtInstrumentFacilityFeeBasisSpreadOnVariableRate_019c5c48-ae73-7c67-b2cf-c2d80aa2eea5" xlink:href="fnf-20251231.xsd#fnf_DebtInstrumentFacilityFeeBasisSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_fnf_DebtInstrumentFacilityFeeBasisSpreadOnVariableRate_019c5c48-ae73-7c67-b2cf-c2d80aa2eea5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtInstrumentAverageVariableInterestRate_019c5c48-ae73-7259-8247-f9fcd380adf2" xlink:href="fnf-20251231.xsd#fnf_DebtInstrumentAverageVariableInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_fnf_DebtInstrumentAverageVariableInterestRate_019c5c48-ae73-7259-8247-f9fcd380adf2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditCurrent_019c5c49-2c5d-72be-a207-6ee2ed25e2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LinesOfCreditCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_LinesOfCreditCurrent_019c5c49-2c5d-72be-a207-6ee2ed25e2f0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c5c49-2c5d-717b-ae3e-26e159355234" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c5c49-2c5d-717b-ae3e-26e159355234" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019c5c49-2c5d-72d5-8b1b-37d8d559dcff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_019c5c49-2c5d-72d5-8b1b-37d8d559dcff" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019c5c49-2c5d-76c1-bf02-e59a6005a7fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019c5c49-2c5d-76c1-bf02-e59a6005a7fc" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_019c5c49-2c5d-74d5-adcd-947b08b0d4a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_019c5c49-2c5d-74d5-adcd-947b08b0d4a2" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019c5c49-2c5d-75e4-b8ee-5c47b3af9352" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019c5c49-2c5d-75e4-b8ee-5c47b3af9352" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019c5c49-2c5d-7987-987f-b36a1381dc8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c5c48-5371-720d-b8ee-3afb51889dc9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019c5c49-2c5d-7987-987f-b36a1381dc8c" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_939bf298-4938-41d9-941a-901b6c41ae48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_us-gaap_LitigationStatusAxis_939bf298-4938-41d9-941a-901b6c41ae48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_939bf298-4938-41d9-941a-901b6c41ae48_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_939bf298-4938-41d9-941a-901b6c41ae48" xlink:to="loc_us-gaap_LitigationStatusDomain_939bf298-4938-41d9-941a-901b6c41ae48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_74a52c82-a964-46fc-9c05-acdfebaec8cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_939bf298-4938-41d9-941a-901b6c41ae48" xlink:to="loc_us-gaap_LitigationStatusDomain_74a52c82-a964-46fc-9c05-acdfebaec8cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_f1f4871f-34a6-425e-baf1-8dcd617226fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_74a52c82-a964-46fc-9c05-acdfebaec8cf" xlink:to="loc_us-gaap_PendingLitigationMember_f1f4871f-34a6-425e-baf1-8dcd617226fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_a1debac4-6520-4173-b337-6fae01f77d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_a1debac4-6520-4173-b337-6fae01f77d8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_a1debac4-6520-4173-b337-6fae01f77d8e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_a1debac4-6520-4173-b337-6fae01f77d8e" xlink:to="loc_us-gaap_LossContingencyNatureDomain_a1debac4-6520-4173-b337-6fae01f77d8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_08d30738-e60a-47a4-ac58-4e5357153839" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_a1debac4-6520-4173-b337-6fae01f77d8e" xlink:to="loc_us-gaap_LossContingencyNatureDomain_08d30738-e60a-47a4-ac58-4e5357153839" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_BreachOfContractMember_100262a8-ceb1-4213-a2c3-a364a665cc28" xlink:href="fnf-20251231.xsd#fnf_BreachOfContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_08d30738-e60a-47a4-ac58-4e5357153839" xlink:to="loc_fnf_BreachOfContractMember_100262a8-ceb1-4213-a2c3-a364a665cc28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FailureToPurchaseInterestInContractsMember_48a05d3b-94c7-476f-a38f-bea6297c5d13" xlink:href="fnf-20251231.xsd#fnf_FailureToPurchaseInterestInContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_08d30738-e60a-47a4-ac58-4e5357153839" xlink:to="loc_fnf_FailureToPurchaseInterestInContractsMember_48a05d3b-94c7-476f-a38f-bea6297c5d13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DamagesFromProductDefectsMember_cf8548f1-13a5-4532-8893-909b110c1c89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DamagesFromProductDefectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_08d30738-e60a-47a4-ac58-4e5357153839" xlink:to="loc_us-gaap_DamagesFromProductDefectsMember_cf8548f1-13a5-4532-8893-909b110c1c89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_633bd1d4-397d-4770-be54-cc3392a330a5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_srt_LitigationCaseAxis_633bd1d4-397d-4770-be54-cc3392a330a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_633bd1d4-397d-4770-be54-cc3392a330a5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_633bd1d4-397d-4770-be54-cc3392a330a5" xlink:to="loc_srt_LitigationCaseTypeDomain_633bd1d4-397d-4770-be54-cc3392a330a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_cd22e26d-2add-463b-a54e-115d5a4edd28" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_633bd1d4-397d-4770-be54-cc3392a330a5" xlink:to="loc_srt_LitigationCaseTypeDomain_cd22e26d-2add-463b-a54e-115d5a4edd28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InsuranceDistributionConsultingLLCV.FidelityGuarantyLifeInsuranceCompanyMember_52702a1b-32a2-4834-ac4c-acc179fd89e2" xlink:href="fnf-20251231.xsd#fnf_InsuranceDistributionConsultingLLCV.FidelityGuarantyLifeInsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_cd22e26d-2add-463b-a54e-115d5a4edd28" xlink:to="loc_fnf_InsuranceDistributionConsultingLLCV.FidelityGuarantyLifeInsuranceCompanyMember_52702a1b-32a2-4834-ac4c-acc179fd89e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CooperVProgressSoftwareCorpNo123Cv12067Member_57efe0db-5c13-45c7-9f6c-3847ea3b651c" xlink:href="fnf-20251231.xsd#fnf_CooperVProgressSoftwareCorpNo123Cv12067Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_cd22e26d-2add-463b-a54e-115d5a4edd28" xlink:to="loc_fnf_CooperVProgressSoftwareCorpNo123Cv12067Member_57efe0db-5c13-45c7-9f6c-3847ea3b651c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_44142dba-6c74-4d38-881f-5192f85d3292" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_44142dba-6c74-4d38-881f-5192f85d3292" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_44142dba-6c74-4d38-881f-5192f85d3292_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_44142dba-6c74-4d38-881f-5192f85d3292" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_44142dba-6c74-4d38-881f-5192f85d3292_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_544ec2e4-7779-4a56-82e2-b81e27c4db2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_44142dba-6c74-4d38-881f-5192f85d3292" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_544ec2e4-7779-4a56-82e2-b81e27c4db2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RoarJointVentureLLCMember_f62714d1-168b-44fb-88c4-9891fe50c470" xlink:href="fnf-20251231.xsd#fnf_RoarJointVentureLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_544ec2e4-7779-4a56-82e2-b81e27c4db2c" xlink:to="loc_fnf_RoarJointVentureLLCMember_f62714d1-168b-44fb-88c4-9891fe50c470" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_9e43388b-d61e-4461-ad05-c5944f7e658e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_9e43388b-d61e-4461-ad05-c5944f7e658e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9e43388b-d61e-4461-ad05-c5944f7e658e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9e43388b-d61e-4461-ad05-c5944f7e658e" xlink:to="loc_us-gaap_SegmentDomain_9e43388b-d61e-4461-ad05-c5944f7e658e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_0ce983a0-0554-45da-a042-c4945190c9d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9e43388b-d61e-4461-ad05-c5944f7e658e" xlink:to="loc_us-gaap_SegmentDomain_0ce983a0-0554-45da-a042-c4945190c9d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_feb77c5a-c8e1-49c8-b82e-ac99357f7763" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_0ce983a0-0554-45da-a042-c4945190c9d4" xlink:to="loc_fnf_FGSegmentMember_feb77c5a-c8e1-49c8-b82e-ac99357f7763" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_01fa3524-2a49-4d00-afea-edd8e1078948" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_us-gaap_CededCreditRiskAxis_01fa3524-2a49-4d00-afea-edd8e1078948" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_01fa3524-2a49-4d00-afea-edd8e1078948_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_01fa3524-2a49-4d00-afea-edd8e1078948" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_01fa3524-2a49-4d00-afea-edd8e1078948_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_a495e023-9f85-4b2a-adad-08a0e6c85449" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_01fa3524-2a49-4d00-afea-edd8e1078948" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_a495e023-9f85-4b2a-adad-08a0e6c85449" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_KuberaReassuranceCompanyMember_3f8a18d5-836f-4c56-9a5d-b8ad438395ff" xlink:href="fnf-20251231.xsd#fnf_KuberaReassuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_a495e023-9f85-4b2a-adad-08a0e6c85449" xlink:to="loc_fnf_KuberaReassuranceCompanyMember_3f8a18d5-836f-4c56-9a5d-b8ad438395ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019b7167-7463-712a-95da-3ba461493032" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_srt_RangeAxis_019b7167-7463-712a-95da-3ba461493032" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019b7167-7463-712a-95da-3ba461493032_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019b7167-7463-712a-95da-3ba461493032" xlink:to="loc_srt_RangeMember_019b7167-7463-712a-95da-3ba461493032_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019b7167-7463-7973-9890-12f2a3d3f0bb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019b7167-7463-712a-95da-3ba461493032" xlink:to="loc_srt_RangeMember_019b7167-7463-7973-9890-12f2a3d3f0bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019b7167-7463-71c6-8118-37cda3c19bc1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019b7167-7463-7973-9890-12f2a3d3f0bb" xlink:to="loc_srt_MaximumMember_019b7167-7463-71c6-8118-37cda3c19bc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019b7167-7463-74cf-ac34-e59eeda6eaa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_d895dd4b-3119-49e6-9ad2-a5165b38ad5b" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019b7167-7463-74cf-ac34-e59eeda6eaa5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019b7167-7463-74cf-ac34-e59eeda6eaa5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019b7167-7463-74cf-ac34-e59eeda6eaa5" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019b7167-7463-74cf-ac34-e59eeda6eaa5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019b7167-7463-7cc0-b2ac-e8292c4997d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019b7167-7463-74cf-ac34-e59eeda6eaa5" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019b7167-7463-7cc0-b2ac-e8292c4997d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LoanCommitmentMember_019b7167-7463-7c20-8498-0e1979ad91b1" xlink:href="fnf-20251231.xsd#fnf_LoanCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019b7167-7463-7cc0-b2ac-e8292c4997d4" xlink:to="loc_fnf_LoanCommitmentMember_019b7167-7463-7c20-8498-0e1979ad91b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationReserve_3d476e74-6ca0-4c1a-8d12-78a3515a92f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_LitigationReserve_3d476e74-6ca0-4c1a-8d12-78a3515a92f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_92c6a214-a2ba-4d47-8d61-24b71542c975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_92c6a214-a2ba-4d47-8d61-24b71542c975" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_9dc02d65-a869-4977-854c-61eaadd608ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_9dc02d65-a869-4977-854c-61eaadd608ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfDefendants_e9459567-d9cb-4cf5-9319-1b4241bd32d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNumberOfDefendants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_LossContingencyNumberOfDefendants_e9459567-d9cb-4cf5-9319-1b4241bd32d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LossContingencyPendingClaimsOtherEntitiesNumber_5b3db88f-b77e-4562-be86-2fa3b83659cb" xlink:href="fnf-20251231.xsd#fnf_LossContingencyPendingClaimsOtherEntitiesNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_fnf_LossContingencyPendingClaimsOtherEntitiesNumber_5b3db88f-b77e-4562-be86-2fa3b83659cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EscrowDeposit_075d941b-52d3-4c37-81e7-91ce5d98bcb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EscrowDeposit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_EscrowDeposit_075d941b-52d3-4c37-81e7-91ce5d98bcb2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019b7167-7463-755a-953e-39ae7d2dd683" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_OtherCommitment_019b7167-7463-755a-953e-39ae7d2dd683" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesGrossCurrent_019c5c68-a02b-7869-a4cc-861f05d443f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_OtherReceivablesGrossCurrent_019c5c68-a02b-7869-a4cc-861f05d443f8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_72e31084-6628-486e-a91b-acf8bffc4ed4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_72e31084-6628-486e-a91b-acf8bffc4ed4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_BusinessCombinationContingentConsiderationLiabilityPaymentPeriod_685a67c4-9d3d-4d68-a871-4a847514e992" xlink:href="fnf-20251231.xsd#fnf_BusinessCombinationContingentConsiderationLiabilityPaymentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_fnf_BusinessCombinationContingentConsiderationLiabilityPaymentPeriod_685a67c4-9d3d-4d68-a871-4a847514e992" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DebtInstrumentAccordionFeatureIncreaseLimit_cad0a03d-2fed-46cb-b112-385b1dbec173" xlink:href="fnf-20251231.xsd#fnf_DebtInstrumentAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_7a808f59-7da9-4e1e-b57e-2faecf012062" xlink:to="loc_fnf_DebtInstrumentAccordionFeatureIncreaseLimit_cad0a03d-2fed-46cb-b112-385b1dbec173" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/CommitmentsandContingenciesUnfundedCommitmentsbyInvestedAssetClassDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#CommitmentsandContingenciesUnfundedCommitmentsbyInvestedAssetClassDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/CommitmentsandContingenciesUnfundedCommitmentsbyInvestedAssetClassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019c5c6a-f567-7423-b30a-6a631b6e547e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_5a5a3b37-d12b-467c-9d4f-c2a49a37df5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c5c6a-f567-7423-b30a-6a631b6e547e" xlink:to="loc_us-gaap_OtherCommitmentsTable_5a5a3b37-d12b-467c-9d4f-c2a49a37df5e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019c5c6a-f567-7601-8d82-25057c716ea4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_5a5a3b37-d12b-467c-9d4f-c2a49a37df5e" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019c5c6a-f567-7601-8d82-25057c716ea4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7601-8d82-25057c716ea4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019c5c6a-f567-7601-8d82-25057c716ea4" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7601-8d82-25057c716ea4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019c5c6a-f567-7601-8d82-25057c716ea4" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FixedMaturitiesAvailableForSaleMember_019c5c6a-f567-73b9-b99a-6150be61000d" xlink:href="fnf-20251231.xsd#fnf_FixedMaturitiesAvailableForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_FixedMaturitiesAvailableForSaleMember_019c5c6a-f567-73b9-b99a-6150be61000d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CommercialMortgageLoansMember_019c5c6a-f567-7438-9bc8-c16a0d125866" xlink:href="fnf-20251231.xsd#fnf_CommercialMortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_CommercialMortgageLoansMember_019c5c6a-f567-7438-9bc8-c16a0d125866" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ResidentialMortgageLoansMember_019c5c6a-f567-7aef-911f-2f2d79503d2d" xlink:href="fnf-20251231.xsd#fnf_ResidentialMortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_ResidentialMortgageLoansMember_019c5c6a-f567-7aef-911f-2f2d79503d2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherAssetCommitmentsMember_019c5c6a-f567-77a5-ace9-79e03ea7aac3" xlink:href="fnf-20251231.xsd#fnf_OtherAssetCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_OtherAssetCommitmentsMember_019c5c6a-f567-77a5-ace9-79e03ea7aac3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestmentsMember_019c5c6a-f567-7c21-8fb6-9dc8ebf5b87a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_us-gaap_OtherLongTermInvestmentsMember_019c5c6a-f567-7c21-8fb6-9dc8ebf5b87a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_019c5c6a-f567-7fd3-ad1f-24e7323c4129" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_019c5c6a-f567-7fd3-ad1f-24e7323c4129" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_WholeLoansMember_019c5c6a-f567-7c0b-8004-837732323718" xlink:href="fnf-20251231.xsd#fnf_WholeLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_WholeLoansMember_019c5c6a-f567-7c0b-8004-837732323718" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FixedMaturitySecuritiesAssetBackedSecuritiesMember_019c5c6a-f567-7cd4-a2e3-5a86ca4bceb9" xlink:href="fnf-20251231.xsd#fnf_FixedMaturitySecuritiesAssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_FixedMaturitySecuritiesAssetBackedSecuritiesMember_019c5c6a-f567-7cd4-a2e3-5a86ca4bceb9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DirectLendingMember_019c5c6a-f567-7286-b7bd-750845d38776" xlink:href="fnf-20251231.xsd#fnf_DirectLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_DirectLendingMember_019c5c6a-f567-7286-b7bd-750845d38776" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CommitmenttoInvestMember_019c5c6a-f567-7810-9bec-526d3ce1c3d8" xlink:href="fnf-20251231.xsd#fnf_CommitmenttoInvestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019c5c6a-f567-7672-b90d-de436844d536" xlink:to="loc_fnf_CommitmenttoInvestMember_019c5c6a-f567-7810-9bec-526d3ce1c3d8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019c5c6a-f567-732d-8252-b28818f0df43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019c5c6a-f567-7423-b30a-6a631b6e547e" xlink:to="loc_us-gaap_OtherCommitment_019c5c6a-f567-732d-8252-b28818f0df43" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/DividendsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#DividendsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/DividendsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019bd540-fa41-7974-9c67-a7ec58081d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019bd540-fa41-7dd1-8e98-9b0813916284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019bd540-fa41-7974-9c67-a7ec58081d8d" xlink:to="loc_us-gaap_SubsequentEventTable_019bd540-fa41-7dd1-8e98-9b0813916284" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019bd540-fa41-72b8-b9e8-0136b364193f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019bd540-fa41-7dd1-8e98-9b0813916284" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019bd540-fa41-72b8-b9e8-0136b364193f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019bd540-fa41-72b8-b9e8-0136b364193f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019bd540-fa41-72b8-b9e8-0136b364193f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019bd540-fa41-72b8-b9e8-0136b364193f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019bd540-fa41-728c-abc1-5ed4aea77e10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019bd540-fa41-72b8-b9e8-0136b364193f" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019bd540-fa41-728c-abc1-5ed4aea77e10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019bd540-fa41-758b-bc6e-1f64a739dd4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019bd540-fa41-728c-abc1-5ed4aea77e10" xlink:to="loc_us-gaap_SubsequentEventMember_019bd540-fa41-758b-bc6e-1f64a739dd4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019bd540-fa41-7cc9-826b-9231ef412b67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019bd540-fa41-7974-9c67-a7ec58081d8d" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019bd540-fa41-7cc9-826b-9231ef412b67" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#SegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_24092c13-9399-4d3d-b5cc-d5671a850797" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_24092c13-9399-4d3d-b5cc-d5671a850797" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_94519a3d-7032-4459-ab27-ace462113ad6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_24092c13-9399-4d3d-b5cc-d5671a850797" xlink:to="loc_srt_ConsolidationItemsAxis_94519a3d-7032-4459-ab27-ace462113ad6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_94519a3d-7032-4459-ab27-ace462113ad6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_94519a3d-7032-4459-ab27-ace462113ad6" xlink:to="loc_srt_ConsolidationItemsDomain_94519a3d-7032-4459-ab27-ace462113ad6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_4e1abd3c-a506-43ab-bcec-30505772cc8e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_94519a3d-7032-4459-ab27-ace462113ad6" xlink:to="loc_srt_ConsolidationItemsDomain_4e1abd3c-a506-43ab-bcec-30505772cc8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_682cd5bb-31f9-4ad1-a27e-a68bf0c0da3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_4e1abd3c-a506-43ab-bcec-30505772cc8e" xlink:to="loc_us-gaap_OperatingSegmentsMember_682cd5bb-31f9-4ad1-a27e-a68bf0c0da3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationEliminationsMember_a1f36ce3-29f9-4e7c-9368-f576fa68397e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_4e1abd3c-a506-43ab-bcec-30505772cc8e" xlink:to="loc_srt_ConsolidationEliminationsMember_a1f36ce3-29f9-4e7c-9368-f576fa68397e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_26283699-ad08-47b0-acf8-005c4c642938" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_24092c13-9399-4d3d-b5cc-d5671a850797" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_26283699-ad08-47b0-acf8-005c4c642938" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_26283699-ad08-47b0-acf8-005c4c642938_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_26283699-ad08-47b0-acf8-005c4c642938" xlink:to="loc_us-gaap_SegmentDomain_26283699-ad08-47b0-acf8-005c4c642938_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_69230e21-c791-4eb3-962a-1e9014b55715" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_26283699-ad08-47b0-acf8-005c4c642938" xlink:to="loc_us-gaap_SegmentDomain_69230e21-c791-4eb3-962a-1e9014b55715" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleSegmentMember_25d0d47a-c2e7-4993-a4ed-1d7e5fa0113f" xlink:href="fnf-20251231.xsd#fnf_TitleSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_69230e21-c791-4eb3-962a-1e9014b55715" xlink:to="loc_fnf_TitleSegmentMember_25d0d47a-c2e7-4993-a4ed-1d7e5fa0113f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_8ada34fa-03c7-45e7-ab13-1cdfc836874d" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_69230e21-c791-4eb3-962a-1e9014b55715" xlink:to="loc_fnf_FGSegmentMember_8ada34fa-03c7-45e7-ab13-1cdfc836874d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_d35a02c7-a2b1-48e7-8e1b-ecba2bf6718e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_69230e21-c791-4eb3-962a-1e9014b55715" xlink:to="loc_us-gaap_CorporateAndOtherMember_d35a02c7-a2b1-48e7-8e1b-ecba2bf6718e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectPremiumsWritten_a72aca19-423d-417e-94b4-1be8a2894894" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DirectPremiumsWritten"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_DirectPremiumsWritten_a72aca19-423d-417e-94b4-1be8a2894894" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssumedPremiumsWritten_1ddb742c-2fb6-4786-aecd-79554b7ae55d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssumedPremiumsWritten"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_AssumedPremiumsWritten_1ddb742c-2fb6-4786-aecd-79554b7ae55d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_1e038922-b8da-44c3-8215-b653a3e326bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_1e038922-b8da-44c3-8215-b653a3e326bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_940cafa5-9944-4986-98af-3c1ce099ed85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_NetInvestmentIncome_940cafa5-9944-4986-98af-3c1ce099ed85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_0a5cf7dc-1acd-4d94-a603-7f53add5866e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_GainLossOnInvestments_0a5cf7dc-1acd-4d94-a603-7f53add5866e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_a6688cb0-ddaf-4af2-af37-674bf61d3982" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_Revenues_a6688cb0-ddaf-4af2-af37-674bf61d3982" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_6c5e0dd7-d8fc-4744-b064-428968b24d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_LaborAndRelatedExpense_6c5e0dd7-d8fc-4744-b064-428968b24d7f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissions_ed6c9560-75f7-4300-be24-096276542343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_InsuranceCommissions_ed6c9560-75f7-4300-be24-096276542343" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_1cdeb8c6-d98d-402e-a1d4-ddff46839fde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_1cdeb8c6-d98d-402e-a1d4-ddff46839fde" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_3c0bef29-78b1-4c99-a9d5-8a96426bc0ae" xlink:href="fnf-20251231.xsd#fnf_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_fnf_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_3c0bef29-78b1-4c99-a9d5-8a96426bc0ae" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_SegmentReportingSignificantExpensesTotal_3eed04dd-b824-49a4-a582-e5eb981777a7" xlink:href="fnf-20251231.xsd#fnf_SegmentReportingSignificantExpensesTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_fnf_SegmentReportingSignificantExpensesTotal_3eed04dd-b824-49a4-a582-e5eb981777a7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_736d2326-24c2-488d-9a9f-66d20a51c892" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_DepreciationAndAmortization_736d2326-24c2-488d-9a9f-66d20a51c892" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_c94e836c-c99d-43bb-8961-e985a61aacee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_c94e836c-c99d-43bb-8961-e985a61aacee" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_59005599-e559-4adf-beca-a2c0dcf9dc00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitChangeInFairValueGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_59005599-e559-4adf-beca-a2c0dcf9dc00" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019b2d75-2471-7b4d-8c1a-67b89894f117" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_InterestExpenseOperating_019b2d75-2471-7b4d-8c1a-67b89894f117" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_SegmentReportingTotalOtherSegmentExpenseItems_2fd8f5f1-6811-40b3-8ec1-a3d23aa0e1c8" xlink:href="fnf-20251231.xsd#fnf_SegmentReportingTotalOtherSegmentExpenseItems"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_fnf_SegmentReportingTotalOtherSegmentExpenseItems_2fd8f5f1-6811-40b3-8ec1-a3d23aa0e1c8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_39db06c8-4818-4fd9-9562-b29dc8160e11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BenefitsLossesAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_BenefitsLossesAndExpenses_39db06c8-4818-4fd9-9562-b29dc8160e11" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_121833cc-d51c-4026-bddf-d75f263ec491" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_121833cc-d51c-4026-bddf-d75f263ec491" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_93c1ffe7-cfe7-4ae1-85a2-f64ed4eda547" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_93c1ffe7-cfe7-4ae1-85a2-f64ed4eda547" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncomeLossFromContinuingOperationsBeforeMinorityInterestAndIncomeLossOnEquityMethodInvestmentsNetOfIncomeTax_8ab32c8d-605d-4cd0-8bdb-2c841a86ea3e" xlink:href="fnf-20251231.xsd#fnf_IncomeLossFromContinuingOperationsBeforeMinorityInterestAndIncomeLossOnEquityMethodInvestmentsNetOfIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_fnf_IncomeLossFromContinuingOperationsBeforeMinorityInterestAndIncomeLossOnEquityMethodInvestmentsNetOfIncomeTax_8ab32c8d-605d-4cd0-8bdb-2c841a86ea3e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_8aa658e9-950e-411a-ab5a-9afac837e5b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_8aa658e9-950e-411a-ab5a-9afac837e5b6" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6e1520b0-5f40-481b-9606-7696cfcd1c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_6e1520b0-5f40-481b-9606-7696cfcd1c1e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_3988895d-dcda-4d0d-be01-b46c061e58d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_Assets_3988895d-dcda-4d0d-be01-b46c061e58d3" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_2a0f9e9b-2715-4a0d-bdf7-1f41ac300725" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d3b454ae-8da0-45d6-b6db-73ed886f775b" xlink:to="loc_us-gaap_Goodwill_2a0f9e9b-2715-4a0d-bdf7-1f41ac300725" xlink:type="arc" order="23"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#RevenueRecognitionDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_dfb57397-5e35-4954-a9cd-359dc1063845" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_dfb57397-5e35-4954-a9cd-359dc1063845" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_d7b0de4a-8a59-47a8-af61-53aa7d80def2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_dfb57397-5e35-4954-a9cd-359dc1063845" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_d7b0de4a-8a59-47a8-af61-53aa7d80def2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d7b0de4a-8a59-47a8-af61-53aa7d80def2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d7b0de4a-8a59-47a8-af61-53aa7d80def2" xlink:to="loc_us-gaap_SegmentDomain_d7b0de4a-8a59-47a8-af61-53aa7d80def2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_85d6ef40-9cea-499a-88df-7b7c9ee90f33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d7b0de4a-8a59-47a8-af61-53aa7d80def2" xlink:to="loc_us-gaap_SegmentDomain_85d6ef40-9cea-499a-88df-7b7c9ee90f33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleSegmentMember_1a9bdb5b-4985-49ae-b3ea-c0bba99ec20e" xlink:href="fnf-20251231.xsd#fnf_TitleSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85d6ef40-9cea-499a-88df-7b7c9ee90f33" xlink:to="loc_fnf_TitleSegmentMember_1a9bdb5b-4985-49ae-b3ea-c0bba99ec20e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_14323d11-de20-493b-940c-11ae1314d795" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85d6ef40-9cea-499a-88df-7b7c9ee90f33" xlink:to="loc_fnf_FGSegmentMember_14323d11-de20-493b-940c-11ae1314d795" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CorporateAndReconcilingItemsMember_d09cd2da-7e3a-41ad-8c28-3b46d208543d" xlink:href="fnf-20251231.xsd#fnf_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_85d6ef40-9cea-499a-88df-7b7c9ee90f33" xlink:to="loc_fnf_CorporateAndReconcilingItemsMember_d09cd2da-7e3a-41ad-8c28-3b46d208543d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_90dc8574-273d-4297-86f4-04c58267bc7f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_dfb57397-5e35-4954-a9cd-359dc1063845" xlink:to="loc_srt_ProductOrServiceAxis_90dc8574-273d-4297-86f4-04c58267bc7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_90dc8574-273d-4297-86f4-04c58267bc7f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_90dc8574-273d-4297-86f4-04c58267bc7f" xlink:to="loc_srt_ProductsAndServicesDomain_90dc8574-273d-4297-86f4-04c58267bc7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_90dc8574-273d-4297-86f4-04c58267bc7f" xlink:to="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InsuranceContractsDirectTitleInsurancePremiumsMember_e6aee014-ac4d-4e20-a336-72217a40d2ad" xlink:href="fnf-20251231.xsd#fnf_InsuranceContractsDirectTitleInsurancePremiumsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_InsuranceContractsDirectTitleInsurancePremiumsMember_e6aee014-ac4d-4e20-a336-72217a40d2ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InsuranceContractsAgencyTitleInsurancePremiumsMember_d227f1f0-189b-4667-b05f-583cbfb2d6e0" xlink:href="fnf-20251231.xsd#fnf_InsuranceContractsAgencyTitleInsurancePremiumsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_InsuranceContractsAgencyTitleInsurancePremiumsMember_d227f1f0-189b-4667-b05f-583cbfb2d6e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LifeInsurancePremiumsInsuranceAndInvestmentProductFeesOtherMember_5d4b5794-7a5b-47b1-82f2-23b76ba10832" xlink:href="fnf-20251231.xsd#fnf_LifeInsurancePremiumsInsuranceAndInvestmentProductFeesOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_LifeInsurancePremiumsInsuranceAndInvestmentProductFeesOtherMember_5d4b5794-7a5b-47b1-82f2-23b76ba10832" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InsuranceContractsHomeWarrantyMember_7d1532b9-35fe-49d3-bb9e-184a45240e25" xlink:href="fnf-20251231.xsd#fnf_InsuranceContractsHomeWarrantyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_InsuranceContractsHomeWarrantyMember_7d1532b9-35fe-49d3-bb9e-184a45240e25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InsuranceContractsMember_6c5f09c7-6c47-4e80-8f1c-d729d14f4f2b" xlink:href="fnf-20251231.xsd#fnf_InsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_InsuranceContractsMember_6c5f09c7-6c47-4e80-8f1c-d729d14f4f2b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EscrowFeesMember_782f95f2-7e33-42d9-8937-ba8aec711e86" xlink:href="fnf-20251231.xsd#fnf_EscrowFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_EscrowFeesMember_782f95f2-7e33-42d9-8937-ba8aec711e86" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherTitleRelatedFeesAndIncomeMember_615e9fa9-e977-4565-8897-3b5c16f511d6" xlink:href="fnf-20251231.xsd#fnf_OtherTitleRelatedFeesAndIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_OtherTitleRelatedFeesAndIncomeMember_615e9fa9-e977-4565-8897-3b5c16f511d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ServiceLinkExcludingTitlePremiumsEscrowFeesAndSubservicingFeesMember_039d1cc5-b92d-4033-8d0b-af8ce80f1b0a" xlink:href="fnf-20251231.xsd#fnf_ServiceLinkExcludingTitlePremiumsEscrowFeesAndSubservicingFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_ServiceLinkExcludingTitlePremiumsEscrowFeesAndSubservicingFeesMember_039d1cc5-b92d-4033-8d0b-af8ce80f1b0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RealEstateTechnologyMember_c72d3406-ae4c-45c8-a6ed-da329ed490bc" xlink:href="fnf-20251231.xsd#fnf_RealEstateTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_RealEstateTechnologyMember_c72d3406-ae4c-45c8-a6ed-da329ed490bc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_OtherProductsAndServicesMember_1e2fa78f-4980-4baa-95fb-c182dcfb9746" xlink:href="fnf-20251231.xsd#fnf_OtherProductsAndServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_OtherProductsAndServicesMember_1e2fa78f-4980-4baa-95fb-c182dcfb9746" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LifeInsurancePremiumsInsuranceAndInvestmentProductFeesOtherPensionRiskTransferMember_73313f31-e034-44b8-8af1-5c0730f05f68" xlink:href="fnf-20251231.xsd#fnf_LifeInsurancePremiumsInsuranceAndInvestmentProductFeesOtherPensionRiskTransferMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b035ebfc-c4e3-4335-bbd7-65e60ef88e79" xlink:to="loc_fnf_LifeInsurancePremiumsInsuranceAndInvestmentProductFeesOtherPensionRiskTransferMember_73313f31-e034-44b8-8af1-5c0730f05f68" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_fcd2d3e9-ed8d-4ad8-8996-2160394fdecf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_fcd2d3e9-ed8d-4ad8-8996-2160394fdecf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FeesAndCommissionsMortgageBankingAndServicing_10507b80-5a5e-4fb5-88aa-59c6920eb622" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FeesAndCommissionsMortgageBankingAndServicing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:to="loc_us-gaap_FeesAndCommissionsMortgageBankingAndServicing_10507b80-5a5e-4fb5-88aa-59c6920eb622" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_033eac7f-cba5-4ebb-9166-c890eadb659b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:to="loc_us-gaap_NetInvestmentIncome_033eac7f-cba5-4ebb-9166-c890eadb659b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_2cad2475-3714-48bf-b4c9-facbe9ea2834" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:to="loc_us-gaap_GainLossOnInvestments_2cad2475-3714-48bf-b4c9-facbe9ea2834" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_77551e72-f963-4322-97c7-fc6186eccbf5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_39a3fb5f-024a-4024-b94e-0d9d6682e1cf" xlink:to="loc_us-gaap_Revenues_77551e72-f963-4322-97c7-fc6186eccbf5" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/RevenueRecognitionPremiumandAnnuityDepositsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#RevenueRecognitionPremiumandAnnuityDepositsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/RevenueRecognitionPremiumandAnnuityDepositsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_aa1704df-99e0-499d-9be7-798f008c89e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_5b040185-081a-40d3-974c-6429d14f33a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_aa1704df-99e0-499d-9be7-798f008c89e1" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_5b040185-081a-40d3-974c-6429d14f33a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1705112c-6d61-4086-91ae-c10d410fe893" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_5b040185-081a-40d3-974c-6429d14f33a1" xlink:to="loc_srt_ProductOrServiceAxis_1705112c-6d61-4086-91ae-c10d410fe893" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1705112c-6d61-4086-91ae-c10d410fe893_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1705112c-6d61-4086-91ae-c10d410fe893" xlink:to="loc_srt_ProductsAndServicesDomain_1705112c-6d61-4086-91ae-c10d410fe893_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7b73794c-19f5-4650-a1d2-9e6c0de34873" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1705112c-6d61-4086-91ae-c10d410fe893" xlink:to="loc_srt_ProductsAndServicesDomain_7b73794c-19f5-4650-a1d2-9e6c0de34873" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_ba8b8f2f-8e8b-4640-9970-ae9fb54b0e69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7b73794c-19f5-4650-a1d2-9e6c0de34873" xlink:to="loc_us-gaap_FixedAnnuityMember_ba8b8f2f-8e8b-4640-9970-ae9fb54b0e69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FixedRateAnnuityMember_6e3ed9ff-612e-441d-9830-236a48b75593" xlink:href="fnf-20251231.xsd#fnf_FixedRateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7b73794c-19f5-4650-a1d2-9e6c0de34873" xlink:to="loc_fnf_FixedRateAnnuityMember_6e3ed9ff-612e-441d-9830-236a48b75593" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundingAgreementBackedNotesMember_cad56c1a-ad55-4cd3-bd30-50385fe09b52" xlink:href="fnf-20251231.xsd#fnf_FundingAgreementBackedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7b73794c-19f5-4650-a1d2-9e6c0de34873" xlink:to="loc_fnf_FundingAgreementBackedNotesMember_cad56c1a-ad55-4cd3-bd30-50385fe09b52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LifeInsuranceMember_7b22ee25-c970-4639-90ac-0fbeee206481" xlink:href="fnf-20251231.xsd#fnf_LifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7b73794c-19f5-4650-a1d2-9e6c0de34873" xlink:to="loc_fnf_LifeInsuranceMember_7b22ee25-c970-4639-90ac-0fbeee206481" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_4198bc82-e713-4016-a55a-575dadcc9000" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_5b040185-081a-40d3-974c-6429d14f33a1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_4198bc82-e713-4016-a55a-575dadcc9000" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4198bc82-e713-4016-a55a-575dadcc9000_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4198bc82-e713-4016-a55a-575dadcc9000" xlink:to="loc_us-gaap_SegmentDomain_4198bc82-e713-4016-a55a-575dadcc9000_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_13bc72fe-4522-4e79-a649-5fd1386beea0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_4198bc82-e713-4016-a55a-575dadcc9000" xlink:to="loc_us-gaap_SegmentDomain_13bc72fe-4522-4e79-a649-5fd1386beea0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_85cd020f-ee79-4349-a772-6244fc1cdf11" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_13bc72fe-4522-4e79-a649-5fd1386beea0" xlink:to="loc_fnf_FGSegmentMember_85cd020f-ee79-4349-a772-6244fc1cdf11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PremiumAndAnnuityDepositsNetOfReinsurance_08caba23-de69-4650-b929-052d37c534b9" xlink:href="fnf-20251231.xsd#fnf_PremiumAndAnnuityDepositsNetOfReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_aa1704df-99e0-499d-9be7-798f008c89e1" xlink:to="loc_fnf_PremiumAndAnnuityDepositsNetOfReinsurance_08caba23-de69-4650-b929-052d37c534b9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/OtherIntangibleAssetsReconciliationofOtherIntangiblestoBalanceSheetDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#OtherIntangibleAssetsReconciliationofOtherIntangiblestoBalanceSheetDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/OtherIntangibleAssetsReconciliationofOtherIntangiblestoBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2ffbbc59-d3d0-4dbe-b4de-456b16ee66de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2ffbbc59-d3d0-4dbe-b4de-456b16ee66de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_aa797956-5b4a-45f5-9e83-6539fb42972a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2ffbbc59-d3d0-4dbe-b4de-456b16ee66de" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_aa797956-5b4a-45f5-9e83-6539fb42972a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_aa797956-5b4a-45f5-9e83-6539fb42972a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_aa797956-5b4a-45f5-9e83-6539fb42972a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_aa797956-5b4a-45f5-9e83-6539fb42972a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_372069d9-8445-46bd-8e4b-a8a00d98f623" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_aa797956-5b4a-45f5-9e83-6539fb42972a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_372069d9-8445-46bd-8e4b-a8a00d98f623" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CustomerRelationshipsAndContractsMember_cf19d121-b123-407d-834e-46ff623c37a7" xlink:href="fnf-20251231.xsd#fnf_CustomerRelationshipsAndContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_372069d9-8445-46bd-8e4b-a8a00d98f623" xlink:to="loc_fnf_CustomerRelationshipsAndContractsMember_cf19d121-b123-407d-834e-46ff623c37a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ValueOfDistributionAssetMember_29fe364f-3e0e-43f6-9497-3a17fc438a1c" xlink:href="fnf-20251231.xsd#fnf_ValueOfDistributionAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_372069d9-8445-46bd-8e4b-a8a00d98f623" xlink:to="loc_fnf_ValueOfDistributionAssetMember_29fe364f-3e0e-43f6-9497-3a17fc438a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_6466e400-d8ff-4d2a-ade4-836d4d53d64e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_372069d9-8445-46bd-8e4b-a8a00d98f623" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_6466e400-d8ff-4d2a-ade4-836d4d53d64e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TrademarksTradenamesAndOtherMember_d563dcec-864b-46b2-8b9f-fcabfeac7cdd" xlink:href="fnf-20251231.xsd#fnf_TrademarksTradenamesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_372069d9-8445-46bd-8e4b-a8a00d98f623" xlink:to="loc_fnf_TrademarksTradenamesAndOtherMember_d563dcec-864b-46b2-8b9f-fcabfeac7cdd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_526c4bb6-db26-4658-861c-154492c3c401" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:to="loc_us-gaap_ValueOfBusinessAcquiredVOBA_526c4bb6-db26-4658-861c-154492c3c401" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredPolicyAcquisitionCostsIncludingFundingAgreements_a84f2e56-8416-465b-822d-03e24cd4a645" xlink:href="fnf-20251231.xsd#fnf_DeferredPolicyAcquisitionCostsIncludingFundingAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:to="loc_fnf_DeferredPolicyAcquisitionCostsIncludingFundingAgreements_a84f2e56-8416-465b-822d-03e24cd4a645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_4f9c7f93-d152-4cdb-9466-3f09dec16bff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:to="loc_us-gaap_DeferredSalesInducementsNet_4f9c7f93-d152-4cdb-9466-3f09dec16bff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_fd8ce7f1-c090-4db3-aad9-68247b6e2960" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_fd8ce7f1-c090-4db3-aad9-68247b6e2960" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_c3344440-87be-4e7d-9e08-0826431ed40c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_538786cd-85c2-496e-93a4-f08c2b97ea90" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_c3344440-87be-4e7d-9e08-0826431ed40c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/OtherIntangibleAssetsVOBADetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#OtherIntangibleAssetsVOBADetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/OtherIntangibleAssetsVOBADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_5e237c8b-3a65-4943-9d6b-6ff0d76590be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitTable_f77ec2c5-7171-42ca-8896-d3a9e1227fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_5e237c8b-3a65-4943-9d6b-6ff0d76590be" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitTable_f77ec2c5-7171-42ca-8896-d3a9e1227fdb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_050baddf-5d69-44d3-8b7f-16cf20081856" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitTable_f77ec2c5-7171-42ca-8896-d3a9e1227fdb" xlink:to="loc_srt_ProductOrServiceAxis_050baddf-5d69-44d3-8b7f-16cf20081856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_050baddf-5d69-44d3-8b7f-16cf20081856_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_050baddf-5d69-44d3-8b7f-16cf20081856" xlink:to="loc_srt_ProductsAndServicesDomain_050baddf-5d69-44d3-8b7f-16cf20081856_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_050baddf-5d69-44d3-8b7f-16cf20081856" xlink:to="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_e76d6522-6ba5-4532-8a9c-6c9e639e8b80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:to="loc_us-gaap_IndexedAnnuityMember_e76d6522-6ba5-4532-8a9c-6c9e639e8b80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_422d9f5f-8669-4aa3-b55d-6a0e163fd9e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:to="loc_us-gaap_FixedAnnuityMember_422d9f5f-8669-4aa3-b55d-6a0e163fd9e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_13201cb4-5e46-4097-a1e9-9e3626e1ccd5" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:to="loc_fnf_ImmediateAnnuityMember_13201cb4-5e46-4097-a1e9-9e3626e1ccd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_e9ce6e50-faaf-47e3-9a91-13828d987efe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:to="loc_us-gaap_UniversalLifeMember_e9ce6e50-faaf-47e3-9a91-13828d987efe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_0f0998c2-c2a6-424b-b744-6a7254d3186b" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_89a2c302-528c-4d74-b35b-3c7c0d615fd0" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_0f0998c2-c2a6-424b-b744-6a7254d3186b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_65dab480-47d2-47ba-ab7d-7b689dfd5250" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_5e237c8b-3a65-4943-9d6b-6ff0d76590be" xlink:to="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_65dab480-47d2-47ba-ab7d-7b689dfd5250" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_bf330af5-ad1a-48d1-b3e9-d906daccf54a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_65dab480-47d2-47ba-ab7d-7b689dfd5250" xlink:to="loc_us-gaap_ValueOfBusinessAcquiredVOBA_bf330af5-ad1a-48d1-b3e9-d906daccf54a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_bca2f4bf-0f7e-4aac-a90f-1250fc5d52c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_65dab480-47d2-47ba-ab7d-7b689dfd5250" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_bca2f4bf-0f7e-4aac-a90f-1250fc5d52c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitExperienceAdjustment_6ada5835-eb46-4b16-b701-ec5b65a2050a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitExperienceAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_65dab480-47d2-47ba-ab7d-7b689dfd5250" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitExperienceAdjustment_6ada5835-eb46-4b16-b701-ec5b65a2050a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_e62db2bd-8ee9-4e54-a893-603716455de1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PresentValueOfFutureInsuranceProfitExperienceAdjustmentAmortization_6b4f1fe4-d1eb-4311-af60-a3bfcad8849e" xlink:href="fnf-20251231.xsd#fnf_PresentValueOfFutureInsuranceProfitExperienceAdjustmentAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_5e237c8b-3a65-4943-9d6b-6ff0d76590be" xlink:to="loc_fnf_PresentValueOfFutureInsuranceProfitExperienceAdjustmentAmortization_6b4f1fe4-d1eb-4311-af60-a3bfcad8849e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/OtherIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#OtherIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/OtherIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ef34e072-364a-400e-a2dd-9c427b73dfdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2994d1f8-d7c2-4a71-b1f5-be20aeeda03c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ef34e072-364a-400e-a2dd-9c427b73dfdd" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2994d1f8-d7c2-4a71-b1f5-be20aeeda03c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722fd4a5-f039-4a6b-b1f2-d50e361976e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2994d1f8-d7c2-4a71-b1f5-be20aeeda03c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722fd4a5-f039-4a6b-b1f2-d50e361976e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_722fd4a5-f039-4a6b-b1f2-d50e361976e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722fd4a5-f039-4a6b-b1f2-d50e361976e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_722fd4a5-f039-4a6b-b1f2-d50e361976e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_635a6b74-8721-4d0d-8683-da4465dc0455" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_722fd4a5-f039-4a6b-b1f2-d50e361976e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_635a6b74-8721-4d0d-8683-da4465dc0455" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TrademarksTradenamesAndOtherMarketRiskBenefitOffsetMember_9615f756-b8f3-4713-b495-08d8ce14ca1d" xlink:href="fnf-20251231.xsd#fnf_TrademarksTradenamesAndOtherMarketRiskBenefitOffsetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_635a6b74-8721-4d0d-8683-da4465dc0455" xlink:to="loc_fnf_TrademarksTradenamesAndOtherMarketRiskBenefitOffsetMember_9615f756-b8f3-4713-b495-08d8ce14ca1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_3417a344-cc34-4b9c-8628-08f58492dbb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ef34e072-364a-400e-a2dd-9c427b73dfdd" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_3417a344-cc34-4b9c-8628-08f58492dbb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_42fd1224-4ade-4aad-89f1-cbf2c6638adb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_ef34e072-364a-400e-a2dd-9c427b73dfdd" xlink:to="loc_us-gaap_DepreciationAndAmortization_42fd1224-4ade-4aad-89f1-cbf2c6638adb" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/OtherIntangibleAssetsDACDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#OtherIntangibleAssetsDACDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/OtherIntangibleAssetsDACDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_bab0376e-cc21-44df-bada-159e5f454136" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostTable_7b6d09d7-0ef8-4a3e-a778-57086b4f6302" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_bab0376e-cc21-44df-bada-159e5f454136" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostTable_7b6d09d7-0ef8-4a3e-a778-57086b4f6302" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_d9f399f2-9afc-4c01-8cf2-72a27d676dee" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostTable_7b6d09d7-0ef8-4a3e-a778-57086b4f6302" xlink:to="loc_srt_ProductOrServiceAxis_d9f399f2-9afc-4c01-8cf2-72a27d676dee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d9f399f2-9afc-4c01-8cf2-72a27d676dee_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_d9f399f2-9afc-4c01-8cf2-72a27d676dee" xlink:to="loc_srt_ProductsAndServicesDomain_d9f399f2-9afc-4c01-8cf2-72a27d676dee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_14f5d53d-eb0d-48f4-97c9-d2c9ce0867ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_d9f399f2-9afc-4c01-8cf2-72a27d676dee" xlink:to="loc_srt_ProductsAndServicesDomain_14f5d53d-eb0d-48f4-97c9-d2c9ce0867ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_430f611d-1660-438f-85db-992e326a5742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_14f5d53d-eb0d-48f4-97c9-d2c9ce0867ad" xlink:to="loc_us-gaap_IndexedAnnuityMember_430f611d-1660-438f-85db-992e326a5742" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_45f1f328-14bf-4fd4-93c6-edd286b0e6a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_14f5d53d-eb0d-48f4-97c9-d2c9ce0867ad" xlink:to="loc_us-gaap_FixedAnnuityMember_45f1f328-14bf-4fd4-93c6-edd286b0e6a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_860be771-0218-4102-936e-5c2469aceeb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_14f5d53d-eb0d-48f4-97c9-d2c9ce0867ad" xlink:to="loc_us-gaap_UniversalLifeMember_860be771-0218-4102-936e-5c2469aceeb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_385c16d3-b5c0-4a5a-9913-98e7b9aad0f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_bab0376e-cc21-44df-bada-159e5f454136" xlink:to="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_385c16d3-b5c0-4a5a-9913-98e7b9aad0f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_1f707b39-5de8-44b8-8a41-ba39b6bbe266" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_385c16d3-b5c0-4a5a-9913-98e7b9aad0f9" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCosts_1f707b39-5de8-44b8-8a41-ba39b6bbe266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_41d7597f-8715-4c12-8dd2-6e21a51c9e98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_385c16d3-b5c0-4a5a-9913-98e7b9aad0f9" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_41d7597f-8715-4c12-8dd2-6e21a51c9e98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_1f207a4f-50db-40db-930d-48bea1aa0ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_385c16d3-b5c0-4a5a-9913-98e7b9aad0f9" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_1f207a4f-50db-40db-930d-48bea1aa0ff6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_395f3c11-a8e2-4125-8d10-96da820e1049" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/OtherIntangibleAssetsReconciliationofDACtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#OtherIntangibleAssetsReconciliationofDACtotheCondensedConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/OtherIntangibleAssetsReconciliationofDACtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_32c82128-9ec8-4dba-9ee1-489c3d95d3b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5096955-26ae-4425-a844-5a347f371d69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_32c82128-9ec8-4dba-9ee1-489c3d95d3b4" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5096955-26ae-4425-a844-5a347f371d69" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_bf1d559c-30c7-4fb6-8c8a-1343fdc4aec9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5096955-26ae-4425-a844-5a347f371d69" xlink:to="loc_srt_ProductOrServiceAxis_bf1d559c-30c7-4fb6-8c8a-1343fdc4aec9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bf1d559c-30c7-4fb6-8c8a-1343fdc4aec9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_bf1d559c-30c7-4fb6-8c8a-1343fdc4aec9" xlink:to="loc_srt_ProductsAndServicesDomain_bf1d559c-30c7-4fb6-8c8a-1343fdc4aec9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_bf1d559c-30c7-4fb6-8c8a-1343fdc4aec9" xlink:to="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_21c4a025-f5e8-4796-b587-eacb8a9ed42e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:to="loc_us-gaap_IndexedAnnuityMember_21c4a025-f5e8-4796-b587-eacb8a9ed42e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_3718ace1-a374-4dc2-b3db-1b14bf769f32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:to="loc_us-gaap_FixedAnnuityMember_3718ace1-a374-4dc2-b3db-1b14bf769f32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_97a9dd98-d5e8-436c-a45b-446d1ef0cf50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:to="loc_us-gaap_UniversalLifeMember_97a9dd98-d5e8-436c-a45b-446d1ef0cf50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundingAgreementBackedNoteMember_019b715a-5958-7979-95b3-7144d3340163" xlink:href="fnf-20251231.xsd#fnf_FundingAgreementBackedNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:to="loc_fnf_FundingAgreementBackedNoteMember_019b715a-5958-7979-95b3-7144d3340163" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PensionRiskTransfersMember_d83b8e94-be73-4875-bfb2-dace27fdb5b0" xlink:href="fnf-20251231.xsd#fnf_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_9c128d05-670d-44e7-a83c-ef39ea1ab1a9" xlink:to="loc_fnf_PensionRiskTransfersMember_d83b8e94-be73-4875-bfb2-dace27fdb5b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredPolicyAcquisitionCostsIncludingFundingAgreements_a6c1d180-88a8-4178-ae80-5a793a7db13f" xlink:href="fnf-20251231.xsd#fnf_DeferredPolicyAcquisitionCostsIncludingFundingAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_32c82128-9ec8-4dba-9ee1-489c3d95d3b4" xlink:to="loc_fnf_DeferredPolicyAcquisitionCostsIncludingFundingAgreements_a6c1d180-88a8-4178-ae80-5a793a7db13f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/OtherIntangibleAssetsDefiniteandIndefiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#OtherIntangibleAssetsDefiniteandIndefiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/OtherIntangibleAssetsDefiniteandIndefiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01918df0-8c5a-42bc-9557-16a1c8a10e28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5694cf6-7b4c-4b93-a7ed-552b644bda54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01918df0-8c5a-42bc-9557-16a1c8a10e28" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5694cf6-7b4c-4b93-a7ed-552b644bda54" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7d915af8-1022-4ec2-9664-03c98ba78525" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5694cf6-7b4c-4b93-a7ed-552b644bda54" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7d915af8-1022-4ec2-9664-03c98ba78525" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7d915af8-1022-4ec2-9664-03c98ba78525_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7d915af8-1022-4ec2-9664-03c98ba78525" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7d915af8-1022-4ec2-9664-03c98ba78525_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1dfba323-c5be-44b8-8a58-d1f22558ccf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7d915af8-1022-4ec2-9664-03c98ba78525" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1dfba323-c5be-44b8-8a58-d1f22558ccf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CustomerRelationshipsAndContractsMember_22f8ef62-4b9c-4b75-a475-ce07570a7c7d" xlink:href="fnf-20251231.xsd#fnf_CustomerRelationshipsAndContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1dfba323-c5be-44b8-8a58-d1f22558ccf4" xlink:to="loc_fnf_CustomerRelationshipsAndContractsMember_22f8ef62-4b9c-4b75-a475-ce07570a7c7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_9a1b0894-2ba7-4078-a91f-efab35e50ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1dfba323-c5be-44b8-8a58-d1f22558ccf4" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_9a1b0894-2ba7-4078-a91f-efab35e50ce4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ValueOfDistributionAssetMember_da555df9-46d1-45ab-9f74-9c8e21daac17" xlink:href="fnf-20251231.xsd#fnf_ValueOfDistributionAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1dfba323-c5be-44b8-8a58-d1f22558ccf4" xlink:to="loc_fnf_ValueOfDistributionAssetMember_da555df9-46d1-45ab-9f74-9c8e21daac17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_a74dd7a5-7399-430e-853f-4de7dbc9f5f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1dfba323-c5be-44b8-8a58-d1f22558ccf4" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_a74dd7a5-7399-430e-853f-4de7dbc9f5f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d271f950-d6f5-46f5-829f-c3d9bd0b742b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f5694cf6-7b4c-4b93-a7ed-552b644bda54" xlink:to="loc_srt_RangeAxis_d271f950-d6f5-46f5-829f-c3d9bd0b742b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d271f950-d6f5-46f5-829f-c3d9bd0b742b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d271f950-d6f5-46f5-829f-c3d9bd0b742b" xlink:to="loc_srt_RangeMember_d271f950-d6f5-46f5-829f-c3d9bd0b742b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_bbcd645b-3605-41a2-82a0-d7c383c76328" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d271f950-d6f5-46f5-829f-c3d9bd0b742b" xlink:to="loc_srt_RangeMember_bbcd645b-3605-41a2-82a0-d7c383c76328" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8515cd9e-40a0-48be-85db-061a378b0763" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bbcd645b-3605-41a2-82a0-d7c383c76328" xlink:to="loc_srt_MinimumMember_8515cd9e-40a0-48be-85db-061a378b0763" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_fda43356-4bb1-4566-9209-4a47163fbfd8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_bbcd645b-3605-41a2-82a0-d7c383c76328" xlink:to="loc_srt_MaximumMember_fda43356-4bb1-4566-9209-4a47163fbfd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_cf6d04e7-1454-4248-b580-8ef00fcb38eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01918df0-8c5a-42bc-9557-16a1c8a10e28" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_cf6d04e7-1454-4248-b580-8ef00fcb38eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c1e31bef-45ac-4a3b-b37f-de2a70723772" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01918df0-8c5a-42bc-9557-16a1c8a10e28" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c1e31bef-45ac-4a3b-b37f-de2a70723772" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b4268d0b-7b9f-481a-be4a-99effe22feec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01918df0-8c5a-42bc-9557-16a1c8a10e28" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_b4268d0b-7b9f-481a-be4a-99effe22feec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_eacbc5c2-9498-455f-80f3-c2ead0a103db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01918df0-8c5a-42bc-9557-16a1c8a10e28" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_eacbc5c2-9498-455f-80f3-c2ead0a103db" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/GoodwillDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#GoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/GoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_4c65ea2a-e289-4c00-99fb-3b3c1c754487" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_b64e89c7-5961-44aa-8549-802fdbe3fd90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_4c65ea2a-e289-4c00-99fb-3b3c1c754487" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_b64e89c7-5961-44aa-8549-802fdbe3fd90" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_224c222b-c708-49ce-acb6-d29be226fe8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_b64e89c7-5961-44aa-8549-802fdbe3fd90" xlink:to="loc_us-gaap_SubsegmentsAxis_224c222b-c708-49ce-acb6-d29be226fe8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_224c222b-c708-49ce-acb6-d29be226fe8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_224c222b-c708-49ce-acb6-d29be226fe8f" xlink:to="loc_us-gaap_SubsegmentsDomain_224c222b-c708-49ce-acb6-d29be226fe8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_b421e1fe-cdff-4f1c-b0f7-45ef9f8e63ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_224c222b-c708-49ce-acb6-d29be226fe8f" xlink:to="loc_us-gaap_SubsegmentsDomain_b421e1fe-cdff-4f1c-b0f7-45ef9f8e63ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleSegmentMember_919b736e-e906-482d-ac51-09fc00bf453c" xlink:href="fnf-20251231.xsd#fnf_TitleSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_b421e1fe-cdff-4f1c-b0f7-45ef9f8e63ae" xlink:to="loc_fnf_TitleSegmentMember_919b736e-e906-482d-ac51-09fc00bf453c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGMember_0515f68d-b2d3-4d02-bf5f-a688244eb552" xlink:href="fnf-20251231.xsd#fnf_FGMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_b421e1fe-cdff-4f1c-b0f7-45ef9f8e63ae" xlink:to="loc_fnf_FGMember_0515f68d-b2d3-4d02-bf5f-a688244eb552" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FidelityNationalFinancialCoreCorporateandOtherSubsegmentMember_c8b95a7e-e066-4557-82bf-892067faf103" xlink:href="fnf-20251231.xsd#fnf_FidelityNationalFinancialCoreCorporateandOtherSubsegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_b421e1fe-cdff-4f1c-b0f7-45ef9f8e63ae" xlink:to="loc_fnf_FidelityNationalFinancialCoreCorporateandOtherSubsegmentMember_c8b95a7e-e066-4557-82bf-892067faf103" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_ba26a6b7-9b3f-4806-8803-40dd38213a61" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_b64e89c7-5961-44aa-8549-802fdbe3fd90" xlink:to="loc_srt_ConsolidationItemsAxis_ba26a6b7-9b3f-4806-8803-40dd38213a61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ba26a6b7-9b3f-4806-8803-40dd38213a61_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ba26a6b7-9b3f-4806-8803-40dd38213a61" xlink:to="loc_srt_ConsolidationItemsDomain_ba26a6b7-9b3f-4806-8803-40dd38213a61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_cc20c10d-6689-4739-a209-a632b0ec4b70" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ba26a6b7-9b3f-4806-8803-40dd38213a61" xlink:to="loc_srt_ConsolidationItemsDomain_cc20c10d-6689-4739-a209-a632b0ec4b70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_6e56d294-af01-4b90-b90b-acc5968cfaeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_cc20c10d-6689-4739-a209-a632b0ec4b70" xlink:to="loc_us-gaap_OperatingSegmentsMember_6e56d294-af01-4b90-b90b-acc5968cfaeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_a492e0a0-9f78-4e06-b411-e6cf746db3a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_4c65ea2a-e289-4c00-99fb-3b3c1c754487" xlink:to="loc_us-gaap_GoodwillRollForward_a492e0a0-9f78-4e06-b411-e6cf746db3a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_0f21700f-a248-4510-ac31-e3a7b330706c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_a492e0a0-9f78-4e06-b411-e6cf746db3a5" xlink:to="loc_us-gaap_Goodwill_0f21700f-a248-4510-ac31-e3a7b330706c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_45762601-c37e-4e71-af46-30b98528c919" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_a492e0a0-9f78-4e06-b411-e6cf746db3a5" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_45762601-c37e-4e71-af46-30b98528c919" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_075a3846-b88b-48c6-bba4-e7a7eea10152" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FGReinsuranceEffectofReinsuranceonPremiumsEarnedBenefitsIncurredandReserveChangesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FGReinsuranceEffectofReinsuranceonPremiumsEarnedBenefitsIncurredandReserveChangesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FGReinsuranceEffectofReinsuranceonPremiumsEarnedBenefitsIncurredandReserveChangesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_9398f2c4-2d5f-491f-b39a-c99e28a332b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_3e1c2a63-be1f-4e6c-9cbb-2068936b500b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_9398f2c4-2d5f-491f-b39a-c99e28a332b0" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_3e1c2a63-be1f-4e6c-9cbb-2068936b500b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_f16032b1-115a-45ed-97f3-61818f1883a0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_3e1c2a63-be1f-4e6c-9cbb-2068936b500b" xlink:to="loc_srt_ProductOrServiceAxis_f16032b1-115a-45ed-97f3-61818f1883a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f16032b1-115a-45ed-97f3-61818f1883a0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_f16032b1-115a-45ed-97f3-61818f1883a0" xlink:to="loc_srt_ProductsAndServicesDomain_f16032b1-115a-45ed-97f3-61818f1883a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_22e41852-535c-498d-b042-b9eacb557950" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_f16032b1-115a-45ed-97f3-61818f1883a0" xlink:to="loc_srt_ProductsAndServicesDomain_22e41852-535c-498d-b042-b9eacb557950" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LifeInsuranceSegmentMember_4a9c15db-46d3-4678-b133-2d7852958340" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LifeInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_22e41852-535c-498d-b042-b9eacb557950" xlink:to="loc_us-gaap_LifeInsuranceSegmentMember_4a9c15db-46d3-4678-b133-2d7852958340" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_157b0dda-f078-45fa-a7ee-d9ac4fc9076b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_9398f2c4-2d5f-491f-b39a-c99e28a332b0" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_157b0dda-f078-45fa-a7ee-d9ac4fc9076b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectPremiumsEarned_f4db8045-c6f5-4ae4-a580-a01fc78258d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DirectPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_157b0dda-f078-45fa-a7ee-d9ac4fc9076b" xlink:to="loc_us-gaap_DirectPremiumsEarned_f4db8045-c6f5-4ae4-a580-a01fc78258d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededPremiumsEarned_ea98cc00-9192-445a-8e50-e5130b0b87f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_157b0dda-f078-45fa-a7ee-d9ac4fc9076b" xlink:to="loc_us-gaap_CededPremiumsEarned_ea98cc00-9192-445a-8e50-e5130b0b87f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_4b1a2b42-728a-4101-9953-98c82d4db12a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_157b0dda-f078-45fa-a7ee-d9ac4fc9076b" xlink:to="loc_us-gaap_PremiumsEarnedNet_4b1a2b42-728a-4101-9953-98c82d4db12a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NetProductFeesAbstract_019b2fa2-3821-70af-81e2-d51a8f66d426" xlink:href="fnf-20251231.xsd#fnf_NetProductFeesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_9398f2c4-2d5f-491f-b39a-c99e28a332b0" xlink:to="loc_fnf_NetProductFeesAbstract_019b2fa2-3821-70af-81e2-d51a8f66d426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DirectProductFees_019b2f95-2d14-79f9-81e3-65a9e4758ad2" xlink:href="fnf-20251231.xsd#fnf_DirectProductFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_NetProductFeesAbstract_019b2fa2-3821-70af-81e2-d51a8f66d426" xlink:to="loc_fnf_DirectProductFees_019b2f95-2d14-79f9-81e3-65a9e4758ad2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CededProductFees_019b2f98-7ad3-7d5a-bd52-39ecd274e487" xlink:href="fnf-20251231.xsd#fnf_CededProductFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_NetProductFeesAbstract_019b2fa2-3821-70af-81e2-d51a8f66d426" xlink:to="loc_fnf_CededProductFees_019b2f98-7ad3-7d5a-bd52-39ecd274e487" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ProductFeesNet_019b2f9a-2c88-7a93-afb7-9339106d01d7" xlink:href="fnf-20251231.xsd#fnf_ProductFeesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_NetProductFeesAbstract_019b2fa2-3821-70af-81e2-d51a8f66d426" xlink:to="loc_fnf_ProductFeesNet_019b2f9a-2c88-7a93-afb7-9339106d01d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_7c18d110-4cc7-4821-b376-5a598656a70f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_9398f2c4-2d5f-491f-b39a-c99e28a332b0" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_7c18d110-4cc7-4821-b376-5a598656a70f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredGross_0fcaf705-a5c9-4593-b99f-de8145eb3b93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_7c18d110-4cc7-4821-b376-5a598656a70f" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredGross_0fcaf705-a5c9-4593-b99f-de8145eb3b93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded_b28f1d32-b81b-4adc-b720-5986733aa1b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_7c18d110-4cc7-4821-b376-5a598656a70f" xlink:to="loc_us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded_b28f1d32-b81b-4adc-b720-5986733aa1b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_08c660e0-7006-4bd2-8de6-6346ba9308b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_7c18d110-4cc7-4821-b376-5a598656a70f" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_08c660e0-7006-4bd2-8de6-6346ba9308b1" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FGReinsuranceNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FGReinsuranceNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FGReinsuranceNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_53aede37-0ab3-40c7-be66-aaacdf9b5ace" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_53aede37-0ab3-40c7-be66-aaacdf9b5ace" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_c0541136-27c2-4d6c-96ca-5286e61e9a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_53aede37-0ab3-40c7-be66-aaacdf9b5ace" xlink:to="loc_us-gaap_CededCreditRiskAxis_c0541136-27c2-4d6c-96ca-5286e61e9a3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_c0541136-27c2-4d6c-96ca-5286e61e9a3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_c0541136-27c2-4d6c-96ca-5286e61e9a3a" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_c0541136-27c2-4d6c-96ca-5286e61e9a3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_00d21d97-44ba-4dc6-86d4-35e981fc1668" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_c0541136-27c2-4d6c-96ca-5286e61e9a3a" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_00d21d97-44ba-4dc6-86d4-35e981fc1668" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RavenReinsuranceCompanyMember_d12805bb-b58f-4dd4-80da-99d3149338e5" xlink:href="fnf-20251231.xsd#fnf_RavenReinsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_00d21d97-44ba-4dc6-86d4-35e981fc1668" xlink:to="loc_fnf_RavenReinsuranceCompanyMember_d12805bb-b58f-4dd4-80da-99d3149338e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGCaymanReLtdMember_f4aa45ab-c4d1-476a-a310-92a3e72fd861" xlink:href="fnf-20251231.xsd#fnf_FGCaymanReLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_00d21d97-44ba-4dc6-86d4-35e981fc1668" xlink:to="loc_fnf_FGCaymanReLtdMember_f4aa45ab-c4d1-476a-a310-92a3e72fd861" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CorbeauReMember_78cdbb74-85ef-4370-b342-0a0e73387f18" xlink:href="fnf-20251231.xsd#fnf_CorbeauReMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_00d21d97-44ba-4dc6-86d4-35e981fc1668" xlink:to="loc_fnf_CorbeauReMember_78cdbb74-85ef-4370-b342-0a0e73387f18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_a84e116c-418b-4062-b5dc-40f2747a8953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_53aede37-0ab3-40c7-be66-aaacdf9b5ace" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_a84e116c-418b-4062-b5dc-40f2747a8953" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_a84e116c-418b-4062-b5dc-40f2747a8953_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_a84e116c-418b-4062-b5dc-40f2747a8953" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_a84e116c-418b-4062-b5dc-40f2747a8953_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_9d30451e-739b-4657-beba-5f64bdcf9f95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_a84e116c-418b-4062-b5dc-40f2747a8953" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_9d30451e-739b-4657-beba-5f64bdcf9f95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IntercompanyReinsuranceAgreementsMember_ec244446-c5f7-4323-a241-10802b6e5c0b" xlink:href="fnf-20251231.xsd#fnf_IntercompanyReinsuranceAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_9d30451e-739b-4657-beba-5f64bdcf9f95" xlink:to="loc_fnf_IntercompanyReinsuranceAgreementsMember_ec244446-c5f7-4323-a241-10802b6e5c0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_19d6a2b7-ea8d-4bbe-b5ac-4b5685a96348" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_53aede37-0ab3-40c7-be66-aaacdf9b5ace" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_19d6a2b7-ea8d-4bbe-b5ac-4b5685a96348" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_19d6a2b7-ea8d-4bbe-b5ac-4b5685a96348_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_19d6a2b7-ea8d-4bbe-b5ac-4b5685a96348" xlink:to="loc_us-gaap_RelatedPartyDomain_19d6a2b7-ea8d-4bbe-b5ac-4b5685a96348_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_ac5129fd-7586-40b9-ac32-fc7946108c8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_19d6a2b7-ea8d-4bbe-b5ac-4b5685a96348" xlink:to="loc_us-gaap_RelatedPartyDomain_ac5129fd-7586-40b9-ac32-fc7946108c8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_5451f014-fee7-49df-bf40-acf290599eb5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_ac5129fd-7586-40b9-ac32-fc7946108c8a" xlink:to="loc_srt_AffiliatedEntityMember_5451f014-fee7-49df-bf40-acf290599eb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NumberOfPoliciesReinsuredByForeignCompanyNotEngagedInInsurance_09cb16a7-7aa1-4399-9644-da12a38d31af" xlink:href="fnf-20251231.xsd#fnf_NumberOfPoliciesReinsuredByForeignCompanyNotEngagedInInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:to="loc_fnf_NumberOfPoliciesReinsuredByForeignCompanyNotEngagedInInsurance_09cb16a7-7aa1-4399-9644-da12a38d31af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositContractsAssets_d31f84b3-6b22-4b48-9697-82154fad43e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositContractsAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:to="loc_us-gaap_DepositContractsAssets_d31f84b3-6b22-4b48-9697-82154fad43e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ReinsuranceRiskChargeFee_83c09e20-bb07-4b3e-8e55-db52b33450e4" xlink:href="fnf-20251231.xsd#fnf_ReinsuranceRiskChargeFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:to="loc_fnf_ReinsuranceRiskChargeFee_83c09e20-bb07-4b3e-8e55-db52b33450e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_cb8c1e28-5d32-4208-9c29-4290aca47e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_cb8c1e28-5d32-4208-9c29-4290aca47e7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ExcessOfLossAgreementMaximumLossCoverage_0ec5dad8-0beb-4e9b-b5f5-71e1b5b6a7f4" xlink:href="fnf-20251231.xsd#fnf_ExcessOfLossAgreementMaximumLossCoverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c827bc2c-14c6-47d5-8e5c-deaf7e2d6af5" xlink:to="loc_fnf_ExcessOfLossAgreementMaximumLossCoverage_0ec5dad8-0beb-4e9b-b5f5-71e1b5b6a7f4" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FGReinsuranceReinsuranceRecoverableDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FGReinsuranceReinsuranceRecoverableDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FGReinsuranceReinsuranceRecoverableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_c7a29a92-1ade-418f-a8d0-fb3c96af566b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_e569552f-c52e-4f9b-8c02-dc46bc9450ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c7a29a92-1ade-418f-a8d0-fb3c96af566b" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_e569552f-c52e-4f9b-8c02-dc46bc9450ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_e69da1d9-34e9-49e5-9845-c0e1ac1b847c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_e569552f-c52e-4f9b-8c02-dc46bc9450ea" xlink:to="loc_us-gaap_CededCreditRiskAxis_e69da1d9-34e9-49e5-9845-c0e1ac1b847c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_e69da1d9-34e9-49e5-9845-c0e1ac1b847c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_e69da1d9-34e9-49e5-9845-c0e1ac1b847c" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_e69da1d9-34e9-49e5-9845-c0e1ac1b847c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_e69da1d9-34e9-49e5-9845-c0e1ac1b847c" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AspidaMember_8982eb61-5ea7-409a-9ddf-53edf4f957d3" xlink:href="fnf-20251231.xsd#fnf_AspidaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:to="loc_fnf_AspidaMember_8982eb61-5ea7-409a-9ddf-53edf4f957d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_SomersetReinsuranceLtd.Member_ceee1ddf-9395-4203-8a4b-082278ef3328" xlink:href="fnf-20251231.xsd#fnf_SomersetReinsuranceLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:to="loc_fnf_SomersetReinsuranceLtd.Member_ceee1ddf-9395-4203-8a4b-082278ef3328" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EverlakeLifeInsuranceCompanyMember_97b4b0e7-72ab-4428-a901-c0dfa324f330" xlink:href="fnf-20251231.xsd#fnf_EverlakeLifeInsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:to="loc_fnf_EverlakeLifeInsuranceCompanyMember_97b4b0e7-72ab-4428-a901-c0dfa324f330" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_WiltonReassuranceCompanyMember_bf5c6bb7-4f68-43bb-86fc-a3b65a94b69d" xlink:href="fnf-20251231.xsd#fnf_WiltonReassuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:to="loc_fnf_WiltonReassuranceCompanyMember_bf5c6bb7-4f68-43bb-86fc-a3b65a94b69d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FortGreeneMember_019c5c85-5079-791e-a5a2-5c1f56abae43" xlink:href="fnf-20251231.xsd#fnf_FortGreeneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:to="loc_fnf_FortGreeneMember_019c5c85-5079-791e-a5a2-5c1f56abae43" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReinsurerMember_aeb2e28d-600e-4a14-b12a-73f515df8ccc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReinsurerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_b9f22eca-2523-4af6-b02d-2749821eaf30" xlink:to="loc_us-gaap_OtherReinsurerMember_aeb2e28d-600e-4a14-b12a-73f515df8ccc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_762f2466-5458-4d20-b300-4c06ffa2523e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_e569552f-c52e-4f9b-8c02-dc46bc9450ea" xlink:to="loc_srt_ProductOrServiceAxis_762f2466-5458-4d20-b300-4c06ffa2523e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_762f2466-5458-4d20-b300-4c06ffa2523e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_762f2466-5458-4d20-b300-4c06ffa2523e" xlink:to="loc_srt_ProductsAndServicesDomain_762f2466-5458-4d20-b300-4c06ffa2523e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_eb646b4e-c171-4b94-9bfa-277525af0067" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_762f2466-5458-4d20-b300-4c06ffa2523e" xlink:to="loc_srt_ProductsAndServicesDomain_eb646b4e-c171-4b94-9bfa-277525af0067" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CertainMYGAMember_0cb5af76-8066-4a3a-934a-d1a50e64796d" xlink:href="fnf-20251231.xsd#fnf_CertainMYGAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb646b4e-c171-4b94-9bfa-277525af0067" xlink:to="loc_fnf_CertainMYGAMember_0cb5af76-8066-4a3a-934a-d1a50e64796d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CertainMYGAAndDeferredAnnuitiesMember_cd01bec1-8be1-45c6-85e5-4f901b345dc2" xlink:href="fnf-20251231.xsd#fnf_CertainMYGAAndDeferredAnnuitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb646b4e-c171-4b94-9bfa-277525af0067" xlink:to="loc_fnf_CertainMYGAAndDeferredAnnuitiesMember_cd01bec1-8be1-45c6-85e5-4f901b345dc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_BlockOfTraditionalIULAndULMember_49488310-e474-4dda-833c-06c6f509de76" xlink:href="fnf-20251231.xsd#fnf_BlockOfTraditionalIULAndULMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_eb646b4e-c171-4b94-9bfa-277525af0067" xlink:to="loc_fnf_BlockOfTraditionalIULAndULMember_49488310-e474-4dda-833c-06c6f509de76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ccbce913-b0a1-4b17-a071-94bb66cfd86f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_e569552f-c52e-4f9b-8c02-dc46bc9450ea" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ccbce913-b0a1-4b17-a071-94bb66cfd86f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ccbce913-b0a1-4b17-a071-94bb66cfd86f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ccbce913-b0a1-4b17-a071-94bb66cfd86f" xlink:to="loc_us-gaap_SegmentDomain_ccbce913-b0a1-4b17-a071-94bb66cfd86f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2249d702-19fd-40e7-8c5d-d7b5ea20b2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ccbce913-b0a1-4b17-a071-94bb66cfd86f" xlink:to="loc_us-gaap_SegmentDomain_2249d702-19fd-40e7-8c5d-d7b5ea20b2cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGMember_e9c33cad-70ae-42d4-a10b-3437b5d48b67" xlink:href="fnf-20251231.xsd#fnf_FGMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_2249d702-19fd-40e7-8c5d-d7b5ea20b2cf" xlink:to="loc_fnf_FGMember_e9c33cad-70ae-42d4-a10b-3437b5d48b67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesGross_905ac77e-384e-41d5-a9d9-3afcd7d66529" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverablesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c7a29a92-1ade-418f-a8d0-fb3c96af566b" xlink:to="loc_us-gaap_ReinsuranceRecoverablesGross_905ac77e-384e-41d5-a9d9-3afcd7d66529" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesAllowance_3d70b7bf-65f2-4c2f-b17f-0e4948bb011f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverablesAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c7a29a92-1ade-418f-a8d0-fb3c96af566b" xlink:to="loc_us-gaap_ReinsuranceRecoverablesAllowance_3d70b7bf-65f2-4c2f-b17f-0e4948bb011f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_907e6e63-53fb-4980-8714-df276dc1233f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_c7a29a92-1ade-418f-a8d0-fb3c96af566b" xlink:to="loc_us-gaap_ReinsuranceRecoverables_907e6e63-53fb-4980-8714-df276dc1233f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/RegulationandEquityNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#RegulationandEquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/RegulationandEquityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_af0bc4cb-f010-49b3-b42c-011ac1944571" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:to="loc_srt_StatementScenarioAxis_af0bc4cb-f010-49b3-b42c-011ac1944571" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_af0bc4cb-f010-49b3-b42c-011ac1944571_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_af0bc4cb-f010-49b3-b42c-011ac1944571" xlink:to="loc_srt_ScenarioUnspecifiedDomain_af0bc4cb-f010-49b3-b42c-011ac1944571_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_d196d74b-efbc-4342-a05a-43ab4562dd72" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_af0bc4cb-f010-49b3-b42c-011ac1944571" xlink:to="loc_srt_ScenarioUnspecifiedDomain_d196d74b-efbc-4342-a05a-43ab4562dd72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_5c83e552-b38a-45fb-ab0b-4a9187bf7038" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_d196d74b-efbc-4342-a05a-43ab4562dd72" xlink:to="loc_srt_ScenarioForecastMember_5c83e552-b38a-45fb-ab0b-4a9187bf7038" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_cd0523c6-8213-410b-9b9b-ac1044c58af8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesByJurisdictionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:to="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_cd0523c6-8213-410b-9b9b-ac1044c58af8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cd0523c6-8213-410b-9b9b-ac1044c58af8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesJurisdictionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_cd0523c6-8213-410b-9b9b-ac1044c58af8" xlink:to="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cd0523c6-8213-410b-9b9b-ac1044c58af8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_42ad3a6d-34ab-41b3-b77e-8fedb7bbe446" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesJurisdictionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_cd0523c6-8213-410b-9b9b-ac1044c58af8" xlink:to="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_42ad3a6d-34ab-41b3-b77e-8fedb7bbe446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_IA_60cabffb-e931-4f4e-8083-e3b79d66eccb" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_IA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_42ad3a6d-34ab-41b3-b77e-8fedb7bbe446" xlink:to="loc_stpr_IA_60cabffb-e931-4f4e-8083-e3b79d66eccb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NY_c5fe926b-7c72-429f-98aa-08b596326a47" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_42ad3a6d-34ab-41b3-b77e-8fedb7bbe446" xlink:to="loc_stpr_NY_c5fe926b-7c72-429f-98aa-08b596326a47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_VT_6b4fca72-dbff-4890-bd70-cdf6ae75e0a8" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_VT"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_42ad3a6d-34ab-41b3-b77e-8fedb7bbe446" xlink:to="loc_stpr_VT_6b4fca72-dbff-4890-bd70-cdf6ae75e0a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_77eb544c-9ae3-4d5c-9b88-589e572972f0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:to="loc_dei_LegalEntityAxis_77eb544c-9ae3-4d5c-9b88-589e572972f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_77eb544c-9ae3-4d5c-9b88-589e572972f0_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_77eb544c-9ae3-4d5c-9b88-589e572972f0" xlink:to="loc_dei_EntityDomain_77eb544c-9ae3-4d5c-9b88-589e572972f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_faff934f-23a7-47c7-84f9-54a81af01b84" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_77eb544c-9ae3-4d5c-9b88-589e572972f0" xlink:to="loc_dei_EntityDomain_faff934f-23a7-47c7-84f9-54a81af01b84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RavenReinsuranceCompanyMember_a9ed4473-ec56-436d-bf0a-945c2c13e2f8" xlink:href="fnf-20251231.xsd#fnf_RavenReinsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_faff934f-23a7-47c7-84f9-54a81af01b84" xlink:to="loc_fnf_RavenReinsuranceCompanyMember_a9ed4473-ec56-436d-bf0a-945c2c13e2f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_19bfed75-4d1c-4940-b6df-251b31500025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:to="loc_us-gaap_CededCreditRiskAxis_19bfed75-4d1c-4940-b6df-251b31500025" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_19bfed75-4d1c-4940-b6df-251b31500025_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_19bfed75-4d1c-4940-b6df-251b31500025" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_19bfed75-4d1c-4940-b6df-251b31500025_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_bbd6dfa1-dc20-4852-9886-ce39451a5c3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_19bfed75-4d1c-4940-b6df-251b31500025" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_bbd6dfa1-dc20-4852-9886-ce39451a5c3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CorbeauReMember_25336c35-348c-4fba-af50-de5d1b14608a" xlink:href="fnf-20251231.xsd#fnf_CorbeauReMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_bbd6dfa1-dc20-4852-9886-ce39451a5c3c" xlink:to="loc_fnf_CorbeauReMember_25336c35-348c-4fba-af50-de5d1b14608a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RavenReinsuranceCompanyMember_9388b838-2369-45eb-8615-30e7182110e0" xlink:href="fnf-20251231.xsd#fnf_RavenReinsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_bbd6dfa1-dc20-4852-9886-ce39451a5c3c" xlink:to="loc_fnf_RavenReinsuranceCompanyMember_9388b838-2369-45eb-8615-30e7182110e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGCaymanReLtdMember_58eca5b3-2e39-4f65-9c1b-47ac13032bb8" xlink:href="fnf-20251231.xsd#fnf_FGCaymanReLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_bbd6dfa1-dc20-4852-9886-ce39451a5c3c" xlink:to="loc_fnf_FGCaymanReLtdMember_58eca5b3-2e39-4f65-9c1b-47ac13032bb8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_d3b83e2b-1952-495c-bab0-edc32005de77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_348196ad-4061-43a9-8bfb-721ae6d7ee6e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_d3b83e2b-1952-495c-bab0-edc32005de77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d3b83e2b-1952-495c-bab0-edc32005de77_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d3b83e2b-1952-495c-bab0-edc32005de77" xlink:to="loc_us-gaap_SegmentDomain_d3b83e2b-1952-495c-bab0-edc32005de77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_33f3e6a2-1630-4edc-8e7b-be9ed60dcde4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d3b83e2b-1952-495c-bab0-edc32005de77" xlink:to="loc_us-gaap_SegmentDomain_33f3e6a2-1630-4edc-8e7b-be9ed60dcde4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_5295ffc0-bdd6-4003-b36e-3dd5a04ffdc8" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_33f3e6a2-1630-4edc-8e7b-be9ed60dcde4" xlink:to="loc_fnf_FGSegmentMember_5295ffc0-bdd6-4003-b36e-3dd5a04ffdc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus_262b0714-1ad6-4986-ad60-260d00c301ec" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_fnf_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus_262b0714-1ad6-4986-ad60-260d00c301ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesCombinedUnearnedPremiumReserveRequired_7fdd0ccc-ff0f-4f17-b726-6fe34fe43228" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesCombinedUnearnedPremiumReserveRequired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_fnf_StatutoryAccountingPracticesCombinedUnearnedPremiumReserveRequired_7fdd0ccc-ff0f-4f17-b726-6fe34fe43228" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesRetainedEarningsNotAvailableForDividends_1053064c-ade3-41cc-b57d-e5a371a17b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesRetainedEarningsNotAvailableForDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_StatutoryAccountingPracticesRetainedEarningsNotAvailableForDividends_1053064c-ade3-41cc-b57d-e5a371a17b1e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval_6ba8d3cd-d4e2-42b9-8e2e-cf8c56755888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval_6ba8d3cd-d4e2-42b9-8e2e-cf8c56755888" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance_354ea01a-764b-47e7-9130-e31c4eb3ad19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance_354ea01a-764b-47e7-9130-e31c4eb3ad19" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount_5daa9525-c5b9-4f5f-8e70-3baa8f5aea42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount_5daa9525-c5b9-4f5f-8e70-3baa8f5aea42" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinimumNetWorthRequiredForCompliance_57107a4c-4012-4aff-8c98-effea410d2c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinimumNetWorthRequiredForCompliance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_MinimumNetWorthRequiredForCompliance_57107a4c-4012-4aff-8c98-effea410d2c1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval_ff04d64a-7adb-4b2b-be33-14c23e1c1564" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithRegulatoryApproval_ff04d64a-7adb-4b2b-be33-14c23e1c1564" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesNonPermittedPracticeChangeInStatutoryCapitalAndSurplusDeficit_8a6a5be5-0c9d-4cdd-b88d-826d1b1ef686" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesNonPermittedPracticeChangeInStatutoryCapitalAndSurplusDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_fnf_StatutoryAccountingPracticesNonPermittedPracticeChangeInStatutoryCapitalAndSurplusDeficit_8a6a5be5-0c9d-4cdd-b88d-826d1b1ef686" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance_9600000b-8d53-45d0-9c3c-f05c46336329" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_fnf_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance_9600000b-8d53-45d0-9c3c-f05c46336329" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesNumberOfPermittedPractices_019b2e18-b16b-759b-91a5-80e45066a4ed" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesNumberOfPermittedPractices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_fnf_StatutoryAccountingPracticesNumberOfPermittedPractices_019b2e18-b16b-759b-91a5-80e45066a4ed" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount_f6ebafd0-13ff-463c-b383-92ec50b6c9af" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_9f0111ad-0de7-4103-be99-4ea3884d5818" xlink:to="loc_fnf_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount_f6ebafd0-13ff-463c-b383-92ec50b6c9af" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/RegulationandEquityStatutoryIncomeandNetCapitalDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#RegulationandEquityStatutoryIncomeandNetCapitalDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/RegulationandEquityStatutoryIncomeandNetCapitalDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesLineItems_96f7b9cb-b3a9-4dd3-a217-0a2064f5d977" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesTable_6d977310-fc03-4782-90a9-9e1a27e99338" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_96f7b9cb-b3a9-4dd3-a217-0a2064f5d977" xlink:to="loc_us-gaap_StatutoryAccountingPracticesTable_6d977310-fc03-4782-90a9-9e1a27e99338" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_45ff51e9-1b07-4269-9fb5-807267567a93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesByJurisdictionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_6d977310-fc03-4782-90a9-9e1a27e99338" xlink:to="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_45ff51e9-1b07-4269-9fb5-807267567a93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_45ff51e9-1b07-4269-9fb5-807267567a93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesJurisdictionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_45ff51e9-1b07-4269-9fb5-807267567a93" xlink:to="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_45ff51e9-1b07-4269-9fb5-807267567a93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesJurisdictionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_45ff51e9-1b07-4269-9fb5-807267567a93" xlink:to="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_IA_f368eaec-d358-470c-a252-8251ad8333af" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_IA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:to="loc_stpr_IA_f368eaec-d358-470c-a252-8251ad8333af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NY_384e258c-4097-412b-94ab-c0c9686a8150" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:to="loc_stpr_NY_384e258c-4097-412b-94ab-c0c9686a8150" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_VT_deb3375d-abd5-4272-b941-5e3f3fafc915" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_VT"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:to="loc_stpr_VT_deb3375d-abd5-4272-b941-5e3f3fafc915" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_KY_269807b8-c172-4c0a-b48d-ab0d210d6753" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:to="loc_country_KY_269807b8-c172-4c0a-b48d-ab0d210d6753" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BM_50314d71-930d-4d15-b0d9-7a30d5aa626a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BM"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_cfcef20b-7375-41f5-ad5c-61207b0c8f3c" xlink:to="loc_country_BM_50314d71-930d-4d15-b0d9-7a30d5aa626a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5c2cb6f9-5663-4f2c-a1c6-640e43666cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_6d977310-fc03-4782-90a9-9e1a27e99338" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5c2cb6f9-5663-4f2c-a1c6-640e43666cf6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5c2cb6f9-5663-4f2c-a1c6-640e43666cf6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5c2cb6f9-5663-4f2c-a1c6-640e43666cf6" xlink:to="loc_us-gaap_SegmentDomain_5c2cb6f9-5663-4f2c-a1c6-640e43666cf6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5518303b-8c72-4558-ae50-f018233c047e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_5c2cb6f9-5663-4f2c-a1c6-640e43666cf6" xlink:to="loc_us-gaap_SegmentDomain_5518303b-8c72-4558-ae50-f018233c047e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_7f17b472-8a16-4288-b71a-239659ee739e" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5518303b-8c72-4558-ae50-f018233c047e" xlink:to="loc_fnf_FGSegmentMember_7f17b472-8a16-4288-b71a-239659ee739e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_adde3aaf-6445-4b44-9431-38158c31ac01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_6d977310-fc03-4782-90a9-9e1a27e99338" xlink:to="loc_us-gaap_CededCreditRiskAxis_adde3aaf-6445-4b44-9431-38158c31ac01" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_adde3aaf-6445-4b44-9431-38158c31ac01_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_adde3aaf-6445-4b44-9431-38158c31ac01" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_adde3aaf-6445-4b44-9431-38158c31ac01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_3538bcb5-c6d5-46fc-9eec-b35f14ae7678" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_adde3aaf-6445-4b44-9431-38158c31ac01" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_3538bcb5-c6d5-46fc-9eec-b35f14ae7678" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RavenReinsuranceCompanyMember_60f6f6d6-26b6-4d2f-9c63-28d6dd2de7b0" xlink:href="fnf-20251231.xsd#fnf_RavenReinsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_3538bcb5-c6d5-46fc-9eec-b35f14ae7678" xlink:to="loc_fnf_RavenReinsuranceCompanyMember_60f6f6d6-26b6-4d2f-9c63-28d6dd2de7b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_CorbeauReMember_0192660d-4dd6-410d-b823-3d2a26f2afdb" xlink:href="fnf-20251231.xsd#fnf_CorbeauReMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_3538bcb5-c6d5-46fc-9eec-b35f14ae7678" xlink:to="loc_fnf_CorbeauReMember_0192660d-4dd6-410d-b823-3d2a26f2afdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesStatutoryNetIncomeLossAmount_dc8f0ea7-9fc6-4a56-a699-a02ab051a1e4" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesStatutoryNetIncomeLossAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_96f7b9cb-b3a9-4dd3-a217-0a2064f5d977" xlink:to="loc_fnf_StatutoryAccountingPracticesStatutoryNetIncomeLossAmount_dc8f0ea7-9fc6-4a56-a699-a02ab051a1e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance_2944457a-4b85-45da-a54d-0139e5f58b99" xlink:href="fnf-20251231.xsd#fnf_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_96f7b9cb-b3a9-4dd3-a217-0a2064f5d977" xlink:to="loc_fnf_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance_2944457a-4b85-45da-a54d-0139e5f58b99" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/RegulationandEquityEquityDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#RegulationandEquityEquityDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/RegulationandEquityEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_4a069931-32a7-4a00-a924-18edac1e67a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_4a069931-32a7-4a00-a924-18edac1e67a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_34a49416-d135-4e84-9b3a-c964b3f84c80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_4a069931-32a7-4a00-a924-18edac1e67a1" xlink:to="loc_us-gaap_StatementClassOfStockAxis_34a49416-d135-4e84-9b3a-c964b3f84c80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_34a49416-d135-4e84-9b3a-c964b3f84c80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_34a49416-d135-4e84-9b3a-c964b3f84c80" xlink:to="loc_us-gaap_ClassOfStockDomain_34a49416-d135-4e84-9b3a-c964b3f84c80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_033ed826-7cbd-4819-a2d5-877e11b4daf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_34a49416-d135-4e84-9b3a-c964b3f84c80" xlink:to="loc_us-gaap_ClassOfStockDomain_033ed826-7cbd-4819-a2d5-877e11b4daf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_b26c7c64-8cc3-4ab1-abf0-bf82137af518" xlink:href="fnf-20251231.xsd#fnf_FidelityNationalFinancialGroupCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_033ed826-7cbd-4819-a2d5-877e11b4daf2" xlink:to="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_b26c7c64-8cc3-4ab1-abf0-bf82137af518" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_581441c8-221f-4980-9aca-fad2d7ab6ca4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_4a069931-32a7-4a00-a924-18edac1e67a1" xlink:to="loc_srt_ShareRepurchaseProgramAxis_581441c8-221f-4980-9aca-fad2d7ab6ca4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_581441c8-221f-4980-9aca-fad2d7ab6ca4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_581441c8-221f-4980-9aca-fad2d7ab6ca4" xlink:to="loc_srt_ShareRepurchaseProgramDomain_581441c8-221f-4980-9aca-fad2d7ab6ca4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_4d6f418d-6998-4dd7-a1cc-1c721be34fb0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_581441c8-221f-4980-9aca-fad2d7ab6ca4" xlink:to="loc_srt_ShareRepurchaseProgramDomain_4d6f418d-6998-4dd7-a1cc-1c721be34fb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A2021RepurchaseProgramMember_3bea9a8c-abc9-4b9b-941e-b9d9b2d31fc6" xlink:href="fnf-20251231.xsd#fnf_A2021RepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_4d6f418d-6998-4dd7-a1cc-1c721be34fb0" xlink:to="loc_fnf_A2021RepurchaseProgramMember_3bea9a8c-abc9-4b9b-941e-b9d9b2d31fc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A2024RepurchaseProgramMember_99295711-5db6-4e16-b27b-f82aa57adf91" xlink:href="fnf-20251231.xsd#fnf_A2024RepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_4d6f418d-6998-4dd7-a1cc-1c721be34fb0" xlink:to="loc_fnf_A2024RepurchaseProgramMember_99295711-5db6-4e16-b27b-f82aa57adf91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019c5c9b-8240-7dfd-8933-27244bd6f524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_4a069931-32a7-4a00-a924-18edac1e67a1" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019c5c9b-8240-7dfd-8933-27244bd6f524" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c5c9b-8240-7dfd-8933-27244bd6f524_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c5c9b-8240-7dfd-8933-27244bd6f524" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c5c9b-8240-7dfd-8933-27244bd6f524_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c5c9b-8240-72dc-a249-632c841c6cf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c5c9b-8240-7dfd-8933-27244bd6f524" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c5c9b-8240-72dc-a249-632c841c6cf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019c5c9b-e21f-70d8-9e12-44fbcb60c733" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019c5c9b-8240-72dc-a249-632c841c6cf7" xlink:to="loc_us-gaap_SubsequentEventMember_019c5c9b-e21f-70d8-9e12-44fbcb60c733" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_0a4dcf43-3107-4a7b-bb43-a9c2dd00cbc5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:to="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_0a4dcf43-3107-4a7b-bb43-a9c2dd00cbc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramPeriodInForce1_e84421c9-82f0-42bb-98d9-55787bda0917" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramPeriodInForce1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:to="loc_us-gaap_StockRepurchaseProgramPeriodInForce1_e84421c9-82f0-42bb-98d9-55787bda0917" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_eaa327d4-a0bd-498e-a4e8-7fdfd478b689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_eaa327d4-a0bd-498e-a4e8-7fdfd478b689" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c5c9e-22e6-7bfd-a43a-842f173fd4c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c5c9e-22e6-7bfd-a43a-842f173fd4c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019c5c9e-22e6-71dc-9593-ebf5daaea84f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_929fd041-d07f-4ba8-be4d-6a4770804493" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019c5c9e-22e6-71dc-9593-ebf5daaea84f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_03a355ba-a780-4bee-b6ea-3756ea62d426" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_us-gaap_DebtInstrumentTable_03a355ba-a780-4bee-b6ea-3756ea62d426" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3c31b750-dc4e-4acf-841c-ef6f10ddabc8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_03a355ba-a780-4bee-b6ea-3756ea62d426" xlink:to="loc_srt_RangeAxis_3c31b750-dc4e-4acf-841c-ef6f10ddabc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3c31b750-dc4e-4acf-841c-ef6f10ddabc8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3c31b750-dc4e-4acf-841c-ef6f10ddabc8" xlink:to="loc_srt_RangeMember_3c31b750-dc4e-4acf-841c-ef6f10ddabc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f8346dd9-a665-4e4d-b744-ce1cac8d69f0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3c31b750-dc4e-4acf-841c-ef6f10ddabc8" xlink:to="loc_srt_RangeMember_f8346dd9-a665-4e4d-b744-ce1cac8d69f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c997f0cc-b1c2-46ec-8017-7ccd99c84215" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f8346dd9-a665-4e4d-b744-ce1cac8d69f0" xlink:to="loc_srt_MinimumMember_c997f0cc-b1c2-46ec-8017-7ccd99c84215" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_bcfbab37-50f1-4347-8375-d41b39be18fc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f8346dd9-a665-4e4d-b744-ce1cac8d69f0" xlink:to="loc_srt_MaximumMember_bcfbab37-50f1-4347-8375-d41b39be18fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b67afc5c-bf79-4c5e-974d-47a71552b72a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_03a355ba-a780-4bee-b6ea-3756ea62d426" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b67afc5c-bf79-4c5e-974d-47a71552b72a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b67afc5c-bf79-4c5e-974d-47a71552b72a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b67afc5c-bf79-4c5e-974d-47a71552b72a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b67afc5c-bf79-4c5e-974d-47a71552b72a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_edb3b3d9-f085-4ddb-85f1-82636509abc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b67afc5c-bf79-4c5e-974d-47a71552b72a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_edb3b3d9-f085-4ddb-85f1-82636509abc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_c564e14d-aafe-434a-8207-c8f0bdd961a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_edb3b3d9-f085-4ddb-85f1-82636509abc3" xlink:to="loc_us-gaap_LineOfCreditMember_c564e14d-aafe-434a-8207-c8f0bdd961a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_7c6d67cb-58bb-4b12-9538-c9e99543e798" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_03a355ba-a780-4bee-b6ea-3756ea62d426" xlink:to="loc_us-gaap_CreditFacilityAxis_7c6d67cb-58bb-4b12-9538-c9e99543e798" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7c6d67cb-58bb-4b12-9538-c9e99543e798_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_7c6d67cb-58bb-4b12-9538-c9e99543e798" xlink:to="loc_us-gaap_CreditFacilityDomain_7c6d67cb-58bb-4b12-9538-c9e99543e798_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bce02e5b-ff31-44c5-ab6d-c950948f46ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_7c6d67cb-58bb-4b12-9538-c9e99543e798" xlink:to="loc_us-gaap_CreditFacilityDomain_bce02e5b-ff31-44c5-ab6d-c950948f46ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_bb7903dc-855c-45c4-888f-509315b4d6c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bce02e5b-ff31-44c5-ab6d-c950948f46ab" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_bb7903dc-855c-45c4-888f-509315b4d6c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cb03662d-36f6-4464-a9be-d0dcd43471b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_03a355ba-a780-4bee-b6ea-3756ea62d426" xlink:to="loc_us-gaap_DebtInstrumentAxis_cb03662d-36f6-4464-a9be-d0dcd43471b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cb03662d-36f6-4464-a9be-d0dcd43471b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cb03662d-36f6-4464-a9be-d0dcd43471b4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cb03662d-36f6-4464-a9be-d0dcd43471b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_158e2c05-f27d-4c72-9184-58b08bcf0147" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cb03662d-36f6-4464-a9be-d0dcd43471b4" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_158e2c05-f27d-4c72-9184-58b08bcf0147" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RevolvingCreditFacilityDueApril2022Member_72eb257e-6992-4110-a4cf-c8601351022c" xlink:href="fnf-20251231.xsd#fnf_RevolvingCreditFacilityDueApril2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_158e2c05-f27d-4c72-9184-58b08bcf0147" xlink:to="loc_fnf_RevolvingCreditFacilityDueApril2022Member_72eb257e-6992-4110-a4cf-c8601351022c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_95a00183-76c6-4235-8961-24125df05e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_95a00183-76c6-4235-8961-24125df05e7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_ad410003-8251-454b-93cf-652785b815dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_ad410003-8251-454b-93cf-652785b815dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LesseeOperatingLeaseNumberOfOptionsToRenew_0e77ed22-5c29-43af-a82b-46fd7fae64c6" xlink:href="fnf-20251231.xsd#fnf_LesseeOperatingLeaseNumberOfOptionsToRenew"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_fnf_LesseeOperatingLeaseNumberOfOptionsToRenew_0e77ed22-5c29-43af-a82b-46fd7fae64c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_f12be8df-c1df-4282-b521-04795791bd1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_f12be8df-c1df-4282-b521-04795791bd1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_6fff5e60-5699-4e4b-8588-6f79796e30de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_6fff5e60-5699-4e4b-8588-6f79796e30de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_588773b6-8fee-4989-8c1e-97cc57080fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_08052038-f9c3-421d-b318-56a67003d96f" xlink:to="loc_us-gaap_OperatingLeaseCost_588773b6-8fee-4989-8c1e-97cc57080fa9" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/PropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_cd1006e1-47c5-4a2c-9df9-9facfce9c527" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a7437ad4-5ca6-482e-b16c-ad7393bdd622" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_cd1006e1-47c5-4a2c-9df9-9facfce9c527" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a7437ad4-5ca6-482e-b16c-ad7393bdd622" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3805fb5d-c4ad-4a22-953a-e8955208dec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a7437ad4-5ca6-482e-b16c-ad7393bdd622" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3805fb5d-c4ad-4a22-953a-e8955208dec8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3805fb5d-c4ad-4a22-953a-e8955208dec8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3805fb5d-c4ad-4a22-953a-e8955208dec8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3805fb5d-c4ad-4a22-953a-e8955208dec8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3805fb5d-c4ad-4a22-953a-e8955208dec8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FurnitureFixturesandEquipmentMember_7dad61e0-4e32-4aa0-8df1-bf022f4b3746" xlink:href="fnf-20251231.xsd#fnf_FurnitureFixturesandEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:to="loc_fnf_FurnitureFixturesandEquipmentMember_7dad61e0-4e32-4aa0-8df1-bf022f4b3746" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyEquipmentMember_a477cd49-17a4-43aa-8ab9-ce036361187f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TechnologyEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:to="loc_us-gaap_TechnologyEquipmentMember_a477cd49-17a4-43aa-8ab9-ce036361187f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_13172b69-85e8-4caf-9157-00920a8d47d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_13172b69-85e8-4caf-9157-00920a8d47d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_84f75739-8a30-416d-b090-d2771d5d973d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:to="loc_us-gaap_BuildingMember_84f75739-8a30-416d-b090-d2771d5d973d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_a21dbb8b-8fb2-4eb6-ad71-7c99bfb8f77b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:to="loc_us-gaap_LandMember_a21dbb8b-8fb2-4eb6-ad71-7c99bfb8f77b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherMachineryAndEquipmentMember_5b59acc2-dd7e-4ee4-8b80-048fbae722ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherMachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_e92d30ae-a457-4252-b549-cba43df021b9" xlink:to="loc_us-gaap_OtherMachineryAndEquipmentMember_5b59acc2-dd7e-4ee4-8b80-048fbae722ec" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_66e0c7b7-9c80-4e32-9ab9-f814120c5473" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_cd1006e1-47c5-4a2c-9df9-9facfce9c527" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_66e0c7b7-9c80-4e32-9ab9-f814120c5473" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_78cffcd5-a7bf-44ff-ac2a-e256f78d182f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_cd1006e1-47c5-4a2c-9df9-9facfce9c527" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_78cffcd5-a7bf-44ff-ac2a-e256f78d182f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_0c66a47b-a207-4cdb-99e8-f01e34c83a57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_cd1006e1-47c5-4a2c-9df9-9facfce9c527" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_0c66a47b-a207-4cdb-99e8-f01e34c83a57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_e807aba5-12ce-42cb-a133-bfd6e9e7815c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_cd1006e1-47c5-4a2c-9df9-9facfce9c527" xlink:to="loc_us-gaap_Depreciation_e807aba5-12ce-42cb-a133-bfd6e9e7815c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/AccountsPayableandOtherAccruedLiabilitiesScheduleofAccountsPayableandOtherAccruedLiabilitiesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#AccountsPayableandOtherAccruedLiabilitiesScheduleofAccountsPayableandOtherAccruedLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/AccountsPayableandOtherAccruedLiabilitiesScheduleofAccountsPayableandOtherAccruedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:href="fnf-20251231.xsd#fnf_AccountsPayableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccountsPayableTable_6bd84afd-0097-405a-94eb-6fe90694aacc" xlink:href="fnf-20251231.xsd#fnf_AccountsPayableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_AccountsPayableTable_6bd84afd-0097-405a-94eb-6fe90694aacc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_5d15e9a7-2335-4734-93e7-747dc512b6d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_fnf_AccountsPayableTable_6bd84afd-0097-405a-94eb-6fe90694aacc" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_5d15e9a7-2335-4734-93e7-747dc512b6d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_5d15e9a7-2335-4734-93e7-747dc512b6d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_5d15e9a7-2335-4734-93e7-747dc512b6d6" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_5d15e9a7-2335-4734-93e7-747dc512b6d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4d4df46a-1b92-46fc-a5a6-d684998b4f27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_5d15e9a7-2335-4734-93e7-747dc512b6d6" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4d4df46a-1b92-46fc-a5a6-d684998b4f27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_UnearnedRevenueLiabilitiesMember_7c93ee72-cbe2-42b8-9a3d-5a22862115a1" xlink:href="fnf-20251231.xsd#fnf_UnearnedRevenueLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_4d4df46a-1b92-46fc-a5a6-d684998b4f27" xlink:to="loc_fnf_UnearnedRevenueLiabilitiesMember_7c93ee72-cbe2-42b8-9a3d-5a22862115a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedSalariesCurrentAndNoncurrent_9e6783d3-6608-46bc-ba71-d996c1929669" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedSalariesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_AccruedSalariesCurrentAndNoncurrent_9e6783d3-6608-46bc-ba71-d996c1929669" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEmployeeBenefitsCurrentAndNoncurrent_c284f16f-1ae5-4c13-a645-4408b7c5bd79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedEmployeeBenefitsCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_AccruedEmployeeBenefitsCurrentAndNoncurrent_c284f16f-1ae5-4c13-a645-4408b7c5bd79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_c1cc4ce6-eb84-4795-bddd-eb1bcc2a36ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_ContractWithCustomerLiability_c1cc4ce6-eb84-4795-bddd-eb1bcc2a36ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019c9516-ee97-7f90-9c21-ea2d67a4602d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019c9516-ee97-7f90-9c21-ea2d67a4602d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_3f5782f6-293f-447a-95fd-f3db25618308" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_3f5782f6-293f-447a-95fd-f3db25618308" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableTradeCurrentAndNoncurrent_e79a8286-40f3-4706-a2ca-1de180ed76a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableTradeCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_AccountsPayableTradeCurrentAndNoncurrent_e79a8286-40f3-4706-a2ca-1de180ed76a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccrualforRecordingFeesandTransferTaxes_f9f1e07c-9a3e-4db0-b08d-5da14af3240d" xlink:href="fnf-20251231.xsd#fnf_AccrualforRecordingFeesandTransferTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_AccrualforRecordingFeesandTransferTaxes_f9f1e07c-9a3e-4db0-b08d-5da14af3240d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AccruedPremiumTaxes_223d8d41-fc1a-4e7c-b331-3d14f6ad52e9" xlink:href="fnf-20251231.xsd#fnf_AccruedPremiumTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_AccruedPremiumTaxes_223d8d41-fc1a-4e7c-b331-3d14f6ad52e9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LiabilityForPolicyAndContractClaims_8285dafd-bb6b-4ea7-84e9-9186abc5d3fb" xlink:href="fnf-20251231.xsd#fnf_LiabilityForPolicyAndContractClaims"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_LiabilityForPolicyAndContractClaims_8285dafd-bb6b-4ea7-84e9-9186abc5d3fb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RetainedAssetAccount_939e677e-4ee0-41e9-8e6c-9028a59631b2" xlink:href="fnf-20251231.xsd#fnf_RetainedAssetAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_RetainedAssetAccount_939e677e-4ee0-41e9-8e6c-9028a59631b2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RemittancesAndItemsNotAllocated_4259b29d-00ab-474e-8fbe-17bfe2106a88" xlink:href="fnf-20251231.xsd#fnf_RemittancesAndItemsNotAllocated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_RemittancesAndItemsNotAllocated_4259b29d-00ab-474e-8fbe-17bfe2106a88" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DerivativeFuturesLiability_d872c229-9c1a-4851-8a8f-728a90c8e273" xlink:href="fnf-20251231.xsd#fnf_DerivativeFuturesLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_fnf_DerivativeFuturesLiability_d872c229-9c1a-4851-8a8f-728a90c8e273" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_0a59a75a-0d72-4dbe-85a0-d292a122bc84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent_0a59a75a-0d72-4dbe-85a0-d292a122bc84" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_b93e231e-4a54-4dd7-96ec-342069a034b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_AccountsPayableLineItems_7e0ba2de-ebd3-40a0-8e26-f2e7cfa00c7f" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_b93e231e-4a54-4dd7-96ec-342069a034b7" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/AccountsPayableandOtherAccruedLiabilitiesScheduleofRollforwardofUnearnedRevenueLiabilitiesURLDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#AccountsPayableandOtherAccruedLiabilitiesScheduleofRollforwardofUnearnedRevenueLiabilitiesURLDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/AccountsPayableandOtherAccruedLiabilitiesScheduleofRollforwardofUnearnedRevenueLiabilitiesURLDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_e514ec44-6e9b-48d9-9824-fdbd58b3583e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_00bf491c-cd4d-4f4d-b666-6cd96c37741f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_e514ec44-6e9b-48d9-9824-fdbd58b3583e" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_00bf491c-cd4d-4f4d-b666-6cd96c37741f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_4a13d751-e994-4bf0-b618-de7ec3af825d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_00bf491c-cd4d-4f4d-b666-6cd96c37741f" xlink:to="loc_srt_ProductOrServiceAxis_4a13d751-e994-4bf0-b618-de7ec3af825d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_4a13d751-e994-4bf0-b618-de7ec3af825d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_4a13d751-e994-4bf0-b618-de7ec3af825d" xlink:to="loc_srt_ProductsAndServicesDomain_4a13d751-e994-4bf0-b618-de7ec3af825d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bbb13bb8-70bd-4ad9-b691-3467146a169f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_4a13d751-e994-4bf0-b618-de7ec3af825d" xlink:to="loc_srt_ProductsAndServicesDomain_bbb13bb8-70bd-4ad9-b691-3467146a169f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_a58f032b-3fb0-4aff-90e4-7718ef9197f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bbb13bb8-70bd-4ad9-b691-3467146a169f" xlink:to="loc_us-gaap_UniversalLifeMember_a58f032b-3fb0-4aff-90e4-7718ef9197f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ContractWithCustomerLiabilityRollForward_a94f3346-fe9e-45a9-bc71-4ea2edf96e5c" xlink:href="fnf-20251231.xsd#fnf_ContractWithCustomerLiabilityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_e514ec44-6e9b-48d9-9824-fdbd58b3583e" xlink:to="loc_fnf_ContractWithCustomerLiabilityRollForward_a94f3346-fe9e-45a9-bc71-4ea2edf96e5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_00e208ae-d1b8-4a82-90af-ff32bf9ac207" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_ContractWithCustomerLiabilityRollForward_a94f3346-fe9e-45a9-bc71-4ea2edf96e5c" xlink:to="loc_us-gaap_ContractWithCustomerLiability_00e208ae-d1b8-4a82-90af-ff32bf9ac207" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ContractWithCustomerLiabilityAdditions_2cec1b26-8254-4b5a-b870-22983959db43" xlink:href="fnf-20251231.xsd#fnf_ContractWithCustomerLiabilityAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_ContractWithCustomerLiabilityRollForward_a94f3346-fe9e-45a9-bc71-4ea2edf96e5c" xlink:to="loc_fnf_ContractWithCustomerLiabilityAdditions_2cec1b26-8254-4b5a-b870-22983959db43" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ContractWithCustomerAmortization_5b184a38-f64d-42a7-ae07-6151e5f13fcc" xlink:href="fnf-20251231.xsd#fnf_ContractWithCustomerAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_ContractWithCustomerLiabilityRollForward_a94f3346-fe9e-45a9-bc71-4ea2edf96e5c" xlink:to="loc_fnf_ContractWithCustomerAmortization_5b184a38-f64d-42a7-ae07-6151e5f13fcc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_b82de36d-fa44-4a86-9cd9-83b4e3616cde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#IncomeTaxesEffectiveTaxRateReconciliationDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019c7393-645f-7ebc-ac90-64a1b924cf42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTable_019c7393-645f-7d22-94b5-d5fc42c47c22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019c7393-645f-7ebc-ac90-64a1b924cf42" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTable_019c7393-645f-7d22-94b5-d5fc42c47c22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_019c7393-645f-7e5b-8ea9-8d9461be7320" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTable_019c7393-645f-7d22-94b5-d5fc42c47c22" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_019c7393-645f-7e5b-8ea9-8d9461be7320" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019c7393-645f-7e5b-8ea9-8d9461be7320_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019c7393-645f-7e5b-8ea9-8d9461be7320" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019c7393-645f-7e5b-8ea9-8d9461be7320_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019c7393-645f-7baa-9368-7d7a7e8fa264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019c7393-645f-7e5b-8ea9-8d9461be7320" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019c7393-645f-7baa-9368-7d7a7e8fa264" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IllinoisAndFloridaMember_019c7a52-2eb2-7546-98fc-0a7546696966" xlink:href="fnf-20251231.xsd#fnf_IllinoisAndFloridaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019c7393-645f-7baa-9368-7d7a7e8fa264" xlink:to="loc_fnf_IllinoisAndFloridaMember_019c7a52-2eb2-7546-98fc-0a7546696966" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019c7393-645f-7ebc-ac90-64a1b924cf42" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_c3723967-d8bc-4799-abc5-0d22b3174c78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_c3723967-d8bc-4799-abc5-0d22b3174c78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_fd45ca1f-b2e4-41c4-8af2-5370f5cdef98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_fd45ca1f-b2e4-41c4-8af2-5370f5cdef98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_0a528bb2-bc22-4648-bb50-b1acb92d3bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_0a528bb2-bc22-4648-bb50-b1acb92d3bb8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_e4763f68-149f-4df3-9008-99969e58cc82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_e4763f68-149f-4df3-9008-99969e58cc82" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_6b5249df-3957-4ab2-acdf-2edc6daa9c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_6b5249df-3957-4ab2-acdf-2edc6daa9c9c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019c60f1-80c5-7f63-a924-5ab7f827c003" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019c60f1-80c5-7f63-a924-5ab7f827c003" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_EffectiveIncomeTaxReconciliationOfficersCompensationPercent_18f92bd3-41ab-4b6a-b36f-606579b143e4" xlink:href="fnf-20251231.xsd#fnf_EffectiveIncomeTaxReconciliationOfficersCompensationPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_fnf_EffectiveIncomeTaxReconciliationOfficersCompensationPercent_18f92bd3-41ab-4b6a-b36f-606579b143e4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_4e6d977c-2a8b-4ff0-b25b-85d23d985bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_4e6d977c-2a8b-4ff0-b25b-85d23d985bd6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c9533-b4d2-7196-b51c-e24f16af90f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019c60f0-f384-7d61-b80d-c0da52f87d5e" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c9533-b4d2-7196-b51c-e24f16af90f0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019c7393-645f-7ebc-ac90-64a1b924cf42" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_019c60f1-41fd-717f-912e-03bccb98ef1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_019c60f1-41fd-717f-912e-03bccb98ef1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_019c60f1-41fd-7c8e-b58c-1fb76fd8d410" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_019c60f1-41fd-7c8e-b58c-1fb76fd8d410" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCredits_019c60f1-41fd-7b6d-b2d7-ca71500caee8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCredits_019c60f1-41fd-7b6d-b2d7-ca71500caee8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_019c60f1-41fd-7e53-a8fd-d80cab45347e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_019c60f1-41fd-7e53-a8fd-d80cab45347e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_019c60f1-41fd-7e3d-90a7-42c2da0c99bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_019c60f1-41fd-7e3d-90a7-42c2da0c99bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_019c60f1-41fd-74d2-abe5-cee2d625d414" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_019c60f1-41fd-74d2-abe5-cee2d625d414" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c60f1-41fd-788d-956c-bf035dc31bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019c60f0-b441-74ca-a1a5-f785e054605b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c60f1-41fd-788d-956c-bf035dc31bdb" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_1c461568-33bb-4c09-ab66-b839369dbaa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_1c461568-33bb-4c09-ab66-b839369dbaa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_1c461568-33bb-4c09-ab66-b839369dbaa6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1c461568-33bb-4c09-ab66-b839369dbaa6" xlink:to="loc_us-gaap_SegmentDomain_1c461568-33bb-4c09-ab66-b839369dbaa6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9e88854e-97b2-468c-add4-4e558386c185" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_1c461568-33bb-4c09-ab66-b839369dbaa6" xlink:to="loc_us-gaap_SegmentDomain_9e88854e-97b2-468c-add4-4e558386c185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleSegmentMember_e8362558-b015-40ce-8afd-53fae3c21920" xlink:href="fnf-20251231.xsd#fnf_TitleSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9e88854e-97b2-468c-add4-4e558386c185" xlink:to="loc_fnf_TitleSegmentMember_e8362558-b015-40ce-8afd-53fae3c21920" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSegmentMember_02ea5383-a2fb-40c3-b155-98f1f2124792" xlink:href="fnf-20251231.xsd#fnf_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9e88854e-97b2-468c-add4-4e558386c185" xlink:to="loc_fnf_FGSegmentMember_02ea5383-a2fb-40c3-b155-98f1f2124792" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodAxis_1c1c7baa-6fec-4b7e-ae1c-743332d51330" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:to="loc_us-gaap_TaxPeriodAxis_1c1c7baa-6fec-4b7e-ae1c-743332d51330" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_1c1c7baa-6fec-4b7e-ae1c-743332d51330_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_1c1c7baa-6fec-4b7e-ae1c-743332d51330" xlink:to="loc_us-gaap_TaxPeriodDomain_1c1c7baa-6fec-4b7e-ae1c-743332d51330_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_27cab4e2-01c3-4bba-bd0d-d1de6d439a30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_1c1c7baa-6fec-4b7e-ae1c-743332d51330" xlink:to="loc_us-gaap_TaxPeriodDomain_27cab4e2-01c3-4bba-bd0d-d1de6d439a30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarliestTaxYearMember_bba3c225-7a3b-40f6-8c7d-40c89c0a4033" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarliestTaxYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_27cab4e2-01c3-4bba-bd0d-d1de6d439a30" xlink:to="loc_us-gaap_EarliestTaxYearMember_bba3c225-7a3b-40f6-8c7d-40c89c0a4033" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAxis_e2ff48fd-cf7c-4544-becb-4d95992faada" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:to="loc_us-gaap_TaxCreditCarryforwardAxis_e2ff48fd-cf7c-4544-becb-4d95992faada" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_e2ff48fd-cf7c-4544-becb-4d95992faada_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_e2ff48fd-cf7c-4544-becb-4d95992faada" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_e2ff48fd-cf7c-4544-becb-4d95992faada_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardNameDomain_d6414552-6dcc-4c40-8aae-d430a3d9b687" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxCreditCarryforwardNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxCreditCarryforwardAxis_e2ff48fd-cf7c-4544-becb-4d95992faada" xlink:to="loc_us-gaap_TaxCreditCarryforwardNameDomain_d6414552-6dcc-4c40-8aae-d430a3d9b687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralBusinessMember_00fc43b8-4509-4138-989b-c01f3ea2ec90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxCreditCarryforwardNameDomain_d6414552-6dcc-4c40-8aae-d430a3d9b687" xlink:to="loc_us-gaap_GeneralBusinessMember_00fc43b8-4509-4138-989b-c01f3ea2ec90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_d48f8e89-508b-4162-a138-e3f4e67172d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_d48f8e89-508b-4162-a138-e3f4e67172d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_d48f8e89-508b-4162-a138-e3f4e67172d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_d48f8e89-508b-4162-a138-e3f4e67172d2" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_d48f8e89-508b-4162-a138-e3f4e67172d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_2658ee4f-3825-41dd-a7e5-c8843ad77825" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_d48f8e89-508b-4162-a138-e3f4e67172d2" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_2658ee4f-3825-41dd-a7e5-c8843ad77825" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralBusinessMember_a2b7db2e-5628-453c-9377-a8aca4c38e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_2658ee4f-3825-41dd-a7e5-c8843ad77825" xlink:to="loc_us-gaap_GeneralBusinessMember_a2b7db2e-5628-453c-9377-a8aca4c38e1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredTaxAssetCapitalLossMember_6774da8a-8151-4328-ac28-78c1ffbfc58c" xlink:href="fnf-20251231.xsd#fnf_DeferredTaxAssetCapitalLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_2658ee4f-3825-41dd-a7e5-c8843ad77825" xlink:to="loc_fnf_DeferredTaxAssetCapitalLossMember_6774da8a-8151-4328-ac28-78c1ffbfc58c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_10551a28-bc82-4554-b49b-c7a77a0cd081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:to="loc_us-gaap_SubsegmentsAxis_10551a28-bc82-4554-b49b-c7a77a0cd081" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_10551a28-bc82-4554-b49b-c7a77a0cd081_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_10551a28-bc82-4554-b49b-c7a77a0cd081" xlink:to="loc_us-gaap_SubsegmentsDomain_10551a28-bc82-4554-b49b-c7a77a0cd081_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_78ae4ca7-296f-4b98-9273-9d5ac424ee58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_10551a28-bc82-4554-b49b-c7a77a0cd081" xlink:to="loc_us-gaap_SubsegmentsDomain_78ae4ca7-296f-4b98-9273-9d5ac424ee58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGSubsidiariesMember_2a2e3097-2b23-4d82-a52c-2ee9540db1af" xlink:href="fnf-20251231.xsd#fnf_FGSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_78ae4ca7-296f-4b98-9273-9d5ac424ee58" xlink:to="loc_fnf_FGSubsidiariesMember_2a2e3097-2b23-4d82-a52c-2ee9540db1af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredTaxLiabilityAxis_019c6102-6486-74c3-9ade-b771ca0c4383" xlink:href="fnf-20251231.xsd#fnf_DeferredTaxLiabilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_028ae5c2-4fa8-42d0-a726-47b99cfd93a5" xlink:to="loc_fnf_DeferredTaxLiabilityAxis_019c6102-6486-74c3-9ade-b771ca0c4383" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredTaxLiabilityDomain_019c6102-6486-74c3-9ade-b771ca0c4383_default" xlink:href="fnf-20251231.xsd#fnf_DeferredTaxLiabilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fnf_DeferredTaxLiabilityAxis_019c6102-6486-74c3-9ade-b771ca0c4383" xlink:to="loc_fnf_DeferredTaxLiabilityDomain_019c6102-6486-74c3-9ade-b771ca0c4383_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredTaxLiabilityDomain_019c6102-6486-7f69-b2b0-f10ee074b29a" xlink:href="fnf-20251231.xsd#fnf_DeferredTaxLiabilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fnf_DeferredTaxLiabilityAxis_019c6102-6486-74c3-9ade-b771ca0c4383" xlink:to="loc_fnf_DeferredTaxLiabilityDomain_019c6102-6486-7f69-b2b0-f10ee074b29a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredTaxLiabilityUnrealizedGainMember_019c6102-6486-7a29-8072-0c2575be6831" xlink:href="fnf-20251231.xsd#fnf_DeferredTaxLiabilityUnrealizedGainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredTaxLiabilityDomain_019c6102-6486-7f69-b2b0-f10ee074b29a" xlink:to="loc_fnf_DeferredTaxLiabilityUnrealizedGainMember_019c6102-6486-7a29-8072-0c2575be6831" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_019c6103-2f37-726d-93b7-92fdaa65bb9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_DeferredTaxLiabilities_019c6103-2f37-726d-93b7-92fdaa65bb9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_ef666b6a-70e0-4e00-8710-3407bafd4912" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_ef666b6a-70e0-4e00-8710-3407bafd4912" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncreaseDecreaseInDeferredTaxLiabilitiesInvestmentsUnrealizedGains_105faf0d-130a-4bd2-9fe6-3201a2800f08" xlink:href="fnf-20251231.xsd#fnf_IncreaseDecreaseInDeferredTaxLiabilitiesInvestmentsUnrealizedGains"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_IncreaseDecreaseInDeferredTaxLiabilitiesInvestmentsUnrealizedGains_105faf0d-130a-4bd2-9fe6-3201a2800f08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncreaseDecreaseInDeferredTaxLiabilitiesDeferredPolicyAcquisitionCostsAndDeferredSalesInducements_df9d3b38-8e26-4a88-8ef8-5f888160c671" xlink:href="fnf-20251231.xsd#fnf_IncreaseDecreaseInDeferredTaxLiabilitiesDeferredPolicyAcquisitionCostsAndDeferredSalesInducements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_IncreaseDecreaseInDeferredTaxLiabilitiesDeferredPolicyAcquisitionCostsAndDeferredSalesInducements_df9d3b38-8e26-4a88-8ef8-5f888160c671" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncreaseDecreaseDeferredTaxAssetReinsuranceReceivable_ba692bab-3c4f-44c3-af18-f6749c3fa5d2" xlink:href="fnf-20251231.xsd#fnf_IncreaseDecreaseDeferredTaxAssetReinsuranceReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_IncreaseDecreaseDeferredTaxAssetReinsuranceReceivable_ba692bab-3c4f-44c3-af18-f6749c3fa5d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncreaseDecreaseDeferredTaxLiabilityReinsuranceReceivable_236c76fe-4b7a-4b9b-bfb7-1ce0322f737d" xlink:href="fnf-20251231.xsd#fnf_IncreaseDecreaseDeferredTaxLiabilityReinsuranceReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_IncreaseDecreaseDeferredTaxLiabilityReinsuranceReceivable_236c76fe-4b7a-4b9b-bfb7-1ce0322f737d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncreaseDecreaseInDeferredTaxAssetLifeInsuranceReceivables_f7fa3d0f-4839-47e8-a71a-e869fecd330b" xlink:href="fnf-20251231.xsd#fnf_IncreaseDecreaseInDeferredTaxAssetLifeInsuranceReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_IncreaseDecreaseInDeferredTaxAssetLifeInsuranceReceivables_f7fa3d0f-4839-47e8-a71a-e869fecd330b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredTaxLiabilityIncreaseDecreaseAmount_019c6102-6486-7216-8cbd-55fa1e6827aa" xlink:href="fnf-20251231.xsd#fnf_DeferredTaxLiabilityIncreaseDecreaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_DeferredTaxLiabilityIncreaseDecreaseAmount_019c6102-6486-7216-8cbd-55fa1e6827aa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_AdjustmentToDeferredTaxAssets_019c940f-e282-7788-a88f-0111bc95308a" xlink:href="fnf-20251231.xsd#fnf_AdjustmentToDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_fnf_AdjustmentToDeferredTaxAssets_019c940f-e282-7788-a88f-0111bc95308a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_a3f08180-ce61-45f1-9981-cfc42b74328d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_OperatingLossCarryforwards_a3f08180-ce61-45f1-9981-cfc42b74328d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_63e5249e-913f-4d0c-bf1e-6ffc0e0abe54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_63e5249e-913f-4d0c-bf1e-6ffc0e0abe54" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_eedfbc66-4278-4fdb-89d8-215533464a19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_eedfbc66-4278-4fdb-89d8-215533464a19" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_dc6a531d-1a6d-439a-b41c-928331d7303c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_dc6a531d-1a6d-439a-b41c-928331d7303c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_48895a1a-4e08-4048-a5dc-42f4ad390ed9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_48895a1a-4e08-4048-a5dc-42f4ad390ed9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_318ea49b-6326-4e84-a6b0-e42699e1d453" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_318ea49b-6326-4e84-a6b0-e42699e1d453" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReceivable_1469fcfa-d582-4080-b5c0-d64293508159" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_5a418dc9-352a-47ea-8adf-11865ba9b94b" xlink:to="loc_us-gaap_IncomeTaxReceivable_1469fcfa-d582-4080-b5c0-d64293508159" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansStockPurchasePlanDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansStockPurchasePlanDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansStockPurchasePlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_575f7818-fd2c-4b2e-b377-d1581c0000dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1d740a9-96e3-4b14-b9c8-9735653f74a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_575f7818-fd2c-4b2e-b377-d1581c0000dc" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1d740a9-96e3-4b14-b9c8-9735653f74a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_431ffcb4-2f18-4c69-bcc8-ebbe84a614d1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1d740a9-96e3-4b14-b9c8-9735653f74a6" xlink:to="loc_srt_RangeAxis_431ffcb4-2f18-4c69-bcc8-ebbe84a614d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_431ffcb4-2f18-4c69-bcc8-ebbe84a614d1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_431ffcb4-2f18-4c69-bcc8-ebbe84a614d1" xlink:to="loc_srt_RangeMember_431ffcb4-2f18-4c69-bcc8-ebbe84a614d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1fc8519b-3f05-4cd4-8a95-ca43c7924421" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_431ffcb4-2f18-4c69-bcc8-ebbe84a614d1" xlink:to="loc_srt_RangeMember_1fc8519b-3f05-4cd4-8a95-ca43c7924421" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_fb659419-54d5-40ef-8239-4bc32a6f437b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1fc8519b-3f05-4cd4-8a95-ca43c7924421" xlink:to="loc_srt_MinimumMember_fb659419-54d5-40ef-8239-4bc32a6f437b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0b78c8c1-2bd7-4d50-b9ce-7dcf60b05044" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1fc8519b-3f05-4cd4-8a95-ca43c7924421" xlink:to="loc_srt_MaximumMember_0b78c8c1-2bd7-4d50-b9ce-7dcf60b05044" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e30f82f2-f1c0-4b13-9467-4d95db72bfc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c1d740a9-96e3-4b14-b9c8-9735653f74a6" xlink:to="loc_us-gaap_AwardTypeAxis_e30f82f2-f1c0-4b13-9467-4d95db72bfc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e30f82f2-f1c0-4b13-9467-4d95db72bfc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e30f82f2-f1c0-4b13-9467-4d95db72bfc6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e30f82f2-f1c0-4b13-9467-4d95db72bfc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b2d0d682-d015-4c26-9f9a-a322fed527df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e30f82f2-f1c0-4b13-9467-4d95db72bfc6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b2d0d682-d015-4c26-9f9a-a322fed527df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_9abc31dc-abf6-4054-a21b-34b3defd6d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b2d0d682-d015-4c26-9f9a-a322fed527df" xlink:to="loc_us-gaap_EmployeeStockMember_9abc31dc-abf6-4054-a21b-34b3defd6d2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_2b41b6e1-9643-4528-b6bb-503906f48fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_575f7818-fd2c-4b2e-b377-d1581c0000dc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_2b41b6e1-9643-4528-b6bb-503906f48fbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_195a3a4d-1be9-4e4a-b87e-e036fb8e24c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_575f7818-fd2c-4b2e-b377-d1581c0000dc" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_195a3a4d-1be9-4e4a-b87e-e036fb8e24c0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansOmnibusIncentivePlanDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansOmnibusIncentivePlanDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansOmnibusIncentivePlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3974af02-f9f1-48e2-ab73-f4132d2c73b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_58924139-d853-483d-b334-13ad6562f8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3974af02-f9f1-48e2-ab73-f4132d2c73b5" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_58924139-d853-483d-b334-13ad6562f8c5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_b392c7e9-58b5-41d9-aeb6-85fe1cb59bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_58924139-d853-483d-b334-13ad6562f8c5" xlink:to="loc_us-gaap_PlanNameAxis_b392c7e9-58b5-41d9-aeb6-85fe1cb59bc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b392c7e9-58b5-41d9-aeb6-85fe1cb59bc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_b392c7e9-58b5-41d9-aeb6-85fe1cb59bc0" xlink:to="loc_us-gaap_PlanNameDomain_b392c7e9-58b5-41d9-aeb6-85fe1cb59bc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a5134ebd-e8bd-4bf0-b1e2-0f04e1802d13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_b392c7e9-58b5-41d9-aeb6-85fe1cb59bc0" xlink:to="loc_us-gaap_PlanNameDomain_a5134ebd-e8bd-4bf0-b1e2-0f04e1802d13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TheOmnibusPlanMember_ff613e49-a9b9-4462-b2b2-d5993f5c9102" xlink:href="fnf-20251231.xsd#fnf_TheOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a5134ebd-e8bd-4bf0-b1e2-0f04e1802d13" xlink:to="loc_fnf_TheOmnibusPlanMember_ff613e49-a9b9-4462-b2b2-d5993f5c9102" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_845461b8-cbe9-4ce1-9fcc-63e5f81a3a8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_58924139-d853-483d-b334-13ad6562f8c5" xlink:to="loc_us-gaap_AwardTypeAxis_845461b8-cbe9-4ce1-9fcc-63e5f81a3a8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_845461b8-cbe9-4ce1-9fcc-63e5f81a3a8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_845461b8-cbe9-4ce1-9fcc-63e5f81a3a8f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_845461b8-cbe9-4ce1-9fcc-63e5f81a3a8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eab553d7-a62d-4d10-98f0-612c61e8ace0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_845461b8-cbe9-4ce1-9fcc-63e5f81a3a8f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eab553d7-a62d-4d10-98f0-612c61e8ace0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_85f83a74-3871-45e3-bf93-0201b3d3fa26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eab553d7-a62d-4d10-98f0-612c61e8ace0" xlink:to="loc_us-gaap_RestrictedStockMember_85f83a74-3871-45e3-bf93-0201b3d3fa26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_b934a4e1-4563-4a61-ad23-82d053f299ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3974af02-f9f1-48e2-ab73-f4132d2c73b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_b934a4e1-4563-4a61-ad23-82d053f299ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_c0ac3cfe-8008-4eea-97d6-2a4712540fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3974af02-f9f1-48e2-ab73-f4132d2c73b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_c0ac3cfe-8008-4eea-97d6-2a4712540fb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_1b57c7e8-0572-4eeb-9be6-2d6fd858b146" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3974af02-f9f1-48e2-ab73-f4132d2c73b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_1b57c7e8-0572-4eeb-9be6-2d6fd858b146" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_195c0a87-4358-4e3b-918f-c807a2297f91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3974af02-f9f1-48e2-ab73-f4132d2c73b5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_195c0a87-4358-4e3b-918f-c807a2297f91" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansFGOmnibusIncentivePlanDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansFGOmnibusIncentivePlanDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansFGOmnibusIncentivePlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e9f48b5-f9d4-4f36-a667-96ba0b11cc62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e9f48b5-f9d4-4f36-a667-96ba0b11cc62" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_09cc878b-b899-4692-98e7-e8dacd3fc7e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e9f48b5-f9d4-4f36-a667-96ba0b11cc62" xlink:to="loc_us-gaap_PlanNameAxis_09cc878b-b899-4692-98e7-e8dacd3fc7e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_09cc878b-b899-4692-98e7-e8dacd3fc7e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_09cc878b-b899-4692-98e7-e8dacd3fc7e1" xlink:to="loc_us-gaap_PlanNameDomain_09cc878b-b899-4692-98e7-e8dacd3fc7e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_352c6a5f-9663-4dc7-b7bb-c1c44f27db44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_09cc878b-b899-4692-98e7-e8dacd3fc7e1" xlink:to="loc_us-gaap_PlanNameDomain_352c6a5f-9663-4dc7-b7bb-c1c44f27db44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGOmnibusPlanMember_381dfa93-8cff-4b73-bfc9-87ed8a3b0677" xlink:href="fnf-20251231.xsd#fnf_FGOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_352c6a5f-9663-4dc7-b7bb-c1c44f27db44" xlink:to="loc_fnf_FGOmnibusPlanMember_381dfa93-8cff-4b73-bfc9-87ed8a3b0677" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b315f902-0daa-40f0-b060-9cc9023374e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_2e9f48b5-f9d4-4f36-a667-96ba0b11cc62" xlink:to="loc_us-gaap_AwardTypeAxis_b315f902-0daa-40f0-b060-9cc9023374e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b315f902-0daa-40f0-b060-9cc9023374e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b315f902-0daa-40f0-b060-9cc9023374e8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b315f902-0daa-40f0-b060-9cc9023374e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6670bfcc-5225-4ec3-858b-2ab1a4ec81d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b315f902-0daa-40f0-b060-9cc9023374e8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6670bfcc-5225-4ec3-858b-2ab1a4ec81d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_897375c8-6b6a-4280-a8cf-ffabd21a0a20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6670bfcc-5225-4ec3-858b-2ab1a4ec81d0" xlink:to="loc_us-gaap_EmployeeStockOptionMember_897375c8-6b6a-4280-a8cf-ffabd21a0a20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e97af92a-96a8-4d2c-94c2-06e785aa1dac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6670bfcc-5225-4ec3-858b-2ab1a4ec81d0" xlink:to="loc_us-gaap_RestrictedStockMember_e97af92a-96a8-4d2c-94c2-06e785aa1dac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ed4270fe-4e91-48fe-ac17-244309809949" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_ed4270fe-4e91-48fe-ac17-244309809949" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8573dd2a-0803-4235-838e-93a80e8a9a76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_8573dd2a-0803-4235-838e-93a80e8a9a76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_02930e87-ea86-4e6b-8916-c8d6cfc511b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_02930e87-ea86-4e6b-8916-c8d6cfc511b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_329ead2a-f5c3-4422-9f37-38792e7560b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_329ead2a-f5c3-4422-9f37-38792e7560b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_f6d36d9e-d74f-4df2-b262-e78e6de38807" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_73466182-3b17-4004-b61b-aa057aee788b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_f6d36d9e-d74f-4df2-b262-e78e6de38807" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansStockOptionActivityDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansStockOptionActivityDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansStockOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2492dd85-a879-4f14-8eff-0d36401262b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_017ef867-9004-4824-9c90-f7092a95774e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2492dd85-a879-4f14-8eff-0d36401262b7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_017ef867-9004-4824-9c90-f7092a95774e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_23258e9c-251b-4a89-8135-ac67a9ce344a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_017ef867-9004-4824-9c90-f7092a95774e" xlink:to="loc_us-gaap_PlanNameAxis_23258e9c-251b-4a89-8135-ac67a9ce344a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_23258e9c-251b-4a89-8135-ac67a9ce344a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_23258e9c-251b-4a89-8135-ac67a9ce344a" xlink:to="loc_us-gaap_PlanNameDomain_23258e9c-251b-4a89-8135-ac67a9ce344a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_32ed7e69-090e-47c8-86b8-cc9d557539df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_23258e9c-251b-4a89-8135-ac67a9ce344a" xlink:to="loc_us-gaap_PlanNameDomain_32ed7e69-090e-47c8-86b8-cc9d557539df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGOmnibusPlanMember_bc12c1f6-0d9d-4528-9b3b-7d027d586ae1" xlink:href="fnf-20251231.xsd#fnf_FGOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_32ed7e69-090e-47c8-86b8-cc9d557539df" xlink:to="loc_fnf_FGOmnibusPlanMember_bc12c1f6-0d9d-4528-9b3b-7d027d586ae1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_395b1322-dbfd-44d0-941d-a460741cb22b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2492dd85-a879-4f14-8eff-0d36401262b7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_395b1322-dbfd-44d0-941d-a460741cb22b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_144457e8-4b76-4e53-830d-cf34e1de676c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_395b1322-dbfd-44d0-941d-a460741cb22b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_144457e8-4b76-4e53-830d-cf34e1de676c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_513c77b4-b71c-449c-b9e7-c05534919eeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_395b1322-dbfd-44d0-941d-a460741cb22b" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_513c77b4-b71c-449c-b9e7-c05534919eeb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_8ffde242-1deb-4f99-a22a-1f88bbe5a8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_395b1322-dbfd-44d0-941d-a460741cb22b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod_8ffde242-1deb-4f99-a22a-1f88bbe5a8e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_0b38ddce-9486-4fe8-9f7b-fbd1964f07c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_a1025e28-ea6e-4f22-9ff7-8aa3280ba635" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2492dd85-a879-4f14-8eff-0d36401262b7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_a1025e28-ea6e-4f22-9ff7-8aa3280ba635" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_c4f17518-ccdb-4c25-b362-cd724c0ea1b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_a1025e28-ea6e-4f22-9ff7-8aa3280ba635" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_c4f17518-ccdb-4c25-b362-cd724c0ea1b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_435c6d20-0fdf-4fb3-b084-49065d7598e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_a1025e28-ea6e-4f22-9ff7-8aa3280ba635" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_435c6d20-0fdf-4fb3-b084-49065d7598e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4086d391-261b-4a76-9fb8-ef726024163e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_a1025e28-ea6e-4f22-9ff7-8aa3280ba635" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_4086d391-261b-4a76-9fb8-ef726024163e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_b6fd017d-fefd-4a3b-b6a8-7093054ee229" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_ff2b10db-0397-4344-a854-283d310d80a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2492dd85-a879-4f14-8eff-0d36401262b7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_ff2b10db-0397-4344-a854-283d310d80a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_16278caf-e533-4aae-a9d9-2f98b9e83c64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_ff2b10db-0397-4344-a854-283d310d80a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_16278caf-e533-4aae-a9d9-2f98b9e83c64" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansRestrictedStockActivityDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansRestrictedStockActivityDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fdec26-b8c4-418c-b93a-2a5e172b75bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ec1d5c51-7a0f-44b8-8bcf-8dda36d273ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fdec26-b8c4-418c-b93a-2a5e172b75bf" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ec1d5c51-7a0f-44b8-8bcf-8dda36d273ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_453b6d8a-d68e-4313-80d9-bd262af01a08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ec1d5c51-7a0f-44b8-8bcf-8dda36d273ef" xlink:to="loc_us-gaap_PlanNameAxis_453b6d8a-d68e-4313-80d9-bd262af01a08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_453b6d8a-d68e-4313-80d9-bd262af01a08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_453b6d8a-d68e-4313-80d9-bd262af01a08" xlink:to="loc_us-gaap_PlanNameDomain_453b6d8a-d68e-4313-80d9-bd262af01a08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_fff208d1-7c20-44da-b094-1730d27fbe76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_453b6d8a-d68e-4313-80d9-bd262af01a08" xlink:to="loc_us-gaap_PlanNameDomain_fff208d1-7c20-44da-b094-1730d27fbe76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TheOmnibusPlanMember_85b849d2-2251-44ea-9b32-9783b5902d81" xlink:href="fnf-20251231.xsd#fnf_TheOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_fff208d1-7c20-44da-b094-1730d27fbe76" xlink:to="loc_fnf_TheOmnibusPlanMember_85b849d2-2251-44ea-9b32-9783b5902d81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FGOmnibusPlanMember_d188c598-df81-43b0-a0c2-fca02548bf82" xlink:href="fnf-20251231.xsd#fnf_FGOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_fff208d1-7c20-44da-b094-1730d27fbe76" xlink:to="loc_fnf_FGOmnibusPlanMember_d188c598-df81-43b0-a0c2-fca02548bf82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_9ee1b8b4-6bb3-40c4-bf8f-c9f4f1e0ddab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ec1d5c51-7a0f-44b8-8bcf-8dda36d273ef" xlink:to="loc_us-gaap_AwardTypeAxis_9ee1b8b4-6bb3-40c4-bf8f-c9f4f1e0ddab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9ee1b8b4-6bb3-40c4-bf8f-c9f4f1e0ddab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9ee1b8b4-6bb3-40c4-bf8f-c9f4f1e0ddab" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9ee1b8b4-6bb3-40c4-bf8f-c9f4f1e0ddab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7be158b1-1ab8-4bc5-9e7a-28741b4099b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9ee1b8b4-6bb3-40c4-bf8f-c9f4f1e0ddab" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7be158b1-1ab8-4bc5-9e7a-28741b4099b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_bdb2dc2e-2fc0-4f21-b0d1-d9d898b8150a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7be158b1-1ab8-4bc5-9e7a-28741b4099b2" xlink:to="loc_us-gaap_RestrictedStockMember_bdb2dc2e-2fc0-4f21-b0d1-d9d898b8150a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_862c6211-9fac-4ceb-aa6d-eddac9d12203" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ec1d5c51-7a0f-44b8-8bcf-8dda36d273ef" xlink:to="loc_us-gaap_StatementClassOfStockAxis_862c6211-9fac-4ceb-aa6d-eddac9d12203" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_862c6211-9fac-4ceb-aa6d-eddac9d12203_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_862c6211-9fac-4ceb-aa6d-eddac9d12203" xlink:to="loc_us-gaap_ClassOfStockDomain_862c6211-9fac-4ceb-aa6d-eddac9d12203_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_9c51f5f0-e2e3-41c0-aba6-c050d420d242" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_862c6211-9fac-4ceb-aa6d-eddac9d12203" xlink:to="loc_us-gaap_ClassOfStockDomain_9c51f5f0-e2e3-41c0-aba6-c050d420d242" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_f9324afb-4a7a-45e7-a0cd-7cac7441e226" xlink:href="fnf-20251231.xsd#fnf_FidelityNationalFinancialGroupCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_9c51f5f0-e2e3-41c0-aba6-c050d420d242" xlink:to="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_f9324afb-4a7a-45e7-a0cd-7cac7441e226" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_857409e3-e806-49a0-ad2e-71d182c557cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fdec26-b8c4-418c-b93a-2a5e172b75bf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_857409e3-e806-49a0-ad2e-71d182c557cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1fc7a0d8-022e-42a9-b631-1d750f244bd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_857409e3-e806-49a0-ad2e-71d182c557cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1fc7a0d8-022e-42a9-b631-1d750f244bd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8b440e13-7536-4020-aa0b-04d0c962f158" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_857409e3-e806-49a0-ad2e-71d182c557cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8b440e13-7536-4020-aa0b-04d0c962f158" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2651f2db-52df-4edf-a3b4-bd662fdc7100" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_857409e3-e806-49a0-ad2e-71d182c557cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_2651f2db-52df-4edf-a3b4-bd662fdc7100" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0408f16d-7781-4efa-93ed-3b8db1fdfb7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_857409e3-e806-49a0-ad2e-71d182c557cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0408f16d-7781-4efa-93ed-3b8db1fdfb7c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_af04f41d-5905-425b-9aa3-b111f3f4242e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_47d2b5c4-110d-4d92-a04c-09bf92c95cc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fdec26-b8c4-418c-b93a-2a5e172b75bf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_47d2b5c4-110d-4d92-a04c-09bf92c95cc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_072e7a1d-3279-416c-a3fd-54374252893f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_47d2b5c4-110d-4d92-a04c-09bf92c95cc8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_072e7a1d-3279-416c-a3fd-54374252893f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_047323be-5a72-4e6d-9597-c55222eb058a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_47d2b5c4-110d-4d92-a04c-09bf92c95cc8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_047323be-5a72-4e6d-9597-c55222eb058a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_8f0a2501-b3ee-4c03-9977-9fd06fc0269e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_47d2b5c4-110d-4d92-a04c-09bf92c95cc8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_8f0a2501-b3ee-4c03-9977-9fd06fc0269e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_4e13c9e5-2189-4e14-8574-7d54319d1fed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_47d2b5c4-110d-4d92-a04c-09bf92c95cc8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_4e13c9e5-2189-4e14-8574-7d54319d1fed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_246eadcb-9ac6-41fb-b716-ae166ac31054" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_0f7bee2c-a36a-4a9a-a230-69400b41809c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:to="loc_us-gaap_PlanNameAxis_0f7bee2c-a36a-4a9a-a230-69400b41809c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_0f7bee2c-a36a-4a9a-a230-69400b41809c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_0f7bee2c-a36a-4a9a-a230-69400b41809c" xlink:to="loc_us-gaap_PlanNameDomain_0f7bee2c-a36a-4a9a-a230-69400b41809c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_c7ea539c-19ec-4d84-84c2-e3f382507db9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_0f7bee2c-a36a-4a9a-a230-69400b41809c" xlink:to="loc_us-gaap_PlanNameDomain_c7ea539c-19ec-4d84-84c2-e3f382507db9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TheOmnibusPlanMember_78168154-8f2c-443a-84b5-485cd55fa363" xlink:href="fnf-20251231.xsd#fnf_TheOmnibusPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_c7ea539c-19ec-4d84-84c2-e3f382507db9" xlink:to="loc_fnf_TheOmnibusPlanMember_78168154-8f2c-443a-84b5-485cd55fa363" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_84d69066-8ccc-43ef-8261-15781cf03681" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:to="loc_us-gaap_AwardTypeAxis_84d69066-8ccc-43ef-8261-15781cf03681" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_84d69066-8ccc-43ef-8261-15781cf03681_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_84d69066-8ccc-43ef-8261-15781cf03681" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_84d69066-8ccc-43ef-8261-15781cf03681_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d94e5306-cb54-4973-995e-00a484bf79c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_84d69066-8ccc-43ef-8261-15781cf03681" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d94e5306-cb54-4973-995e-00a484bf79c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_c9da10ae-d363-4f69-aac8-d893c67bee38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d94e5306-cb54-4973-995e-00a484bf79c8" xlink:to="loc_us-gaap_RestrictedStockMember_c9da10ae-d363-4f69-aac8-d893c67bee38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1292d3ca-72bf-4d05-9005-d838bc9812ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1292d3ca-72bf-4d05-9005-d838bc9812ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1292d3ca-72bf-4d05-9005-d838bc9812ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1292d3ca-72bf-4d05-9005-d838bc9812ac" xlink:to="loc_us-gaap_ClassOfStockDomain_1292d3ca-72bf-4d05-9005-d838bc9812ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_e0b59de9-1f1b-4abc-97a2-2cbc169d45bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1292d3ca-72bf-4d05-9005-d838bc9812ac" xlink:to="loc_us-gaap_ClassOfStockDomain_e0b59de9-1f1b-4abc-97a2-2cbc169d45bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_1e6eb509-b77d-408e-9db5-7dc99ad90319" xlink:href="fnf-20251231.xsd#fnf_FidelityNationalFinancialGroupCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_e0b59de9-1f1b-4abc-97a2-2cbc169d45bd" xlink:to="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_1e6eb509-b77d-408e-9db5-7dc99ad90319" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_2028ac09-3d03-48dc-b1dd-754f60c9e2bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:to="loc_srt_TitleOfIndividualAxis_2028ac09-3d03-48dc-b1dd-754f60c9e2bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2028ac09-3d03-48dc-b1dd-754f60c9e2bd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_2028ac09-3d03-48dc-b1dd-754f60c9e2bd" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_2028ac09-3d03-48dc-b1dd-754f60c9e2bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6b8b276d-240a-4ea7-b953-ce7631999dad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_2028ac09-3d03-48dc-b1dd-754f60c9e2bd" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6b8b276d-240a-4ea7-b953-ce7631999dad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_BoardOfDirectorsChairmanMember_e203680d-e4a4-4b81-a6cf-e7590098951c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_BoardOfDirectorsChairmanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_6b8b276d-240a-4ea7-b953-ce7631999dad" xlink:to="loc_srt_BoardOfDirectorsChairmanMember_e203680d-e4a4-4b81-a6cf-e7590098951c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_542b2116-9d62-40cc-9178-106b0974fee5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_607702b5-9e59-419f-aee0-cd6babc5d5fb" xlink:to="loc_us-gaap_VestingAxis_542b2116-9d62-40cc-9178-106b0974fee5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_542b2116-9d62-40cc-9178-106b0974fee5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_542b2116-9d62-40cc-9178-106b0974fee5" xlink:to="loc_us-gaap_VestingDomain_542b2116-9d62-40cc-9178-106b0974fee5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_a2b2d2e7-f82d-4c84-ac72-3cade6bf506b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_542b2116-9d62-40cc-9178-106b0974fee5" xlink:to="loc_us-gaap_VestingDomain_a2b2d2e7-f82d-4c84-ac72-3cade6bf506b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_16b52113-287b-408e-b80f-a3a9f59352bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a2b2d2e7-f82d-4c84-ac72-3cade6bf506b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_16b52113-287b-408e-b80f-a3a9f59352bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6c8e368f-f223-46ef-9e88-dcb03457e52e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a2b2d2e7-f82d-4c84-ac72-3cade6bf506b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_6c8e368f-f223-46ef-9e88-dcb03457e52e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_142bb9d7-fc0d-4a93-82ae-1a5a6d8e7062" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a2b2d2e7-f82d-4c84-ac72-3cade6bf506b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_142bb9d7-fc0d-4a93-82ae-1a5a6d8e7062" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ShareBasedPaymentArrangementTrancheFourMember_48f6b8b0-81b2-4bcc-97d3-89349cc8ee74" xlink:href="fnf-20251231.xsd#fnf_ShareBasedPaymentArrangementTrancheFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_a2b2d2e7-f82d-4c84-ac72-3cade6bf506b" xlink:to="loc_fnf_ShareBasedPaymentArrangementTrancheFourMember_48f6b8b0-81b2-4bcc-97d3-89349cc8ee74" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_523e5714-c044-4f5a-a0b8-d686fef9d4fc" xlink:href="fnf-20251231.xsd#fnf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_fnf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue_523e5714-c044-4f5a-a0b8-d686fef9d4fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_12b6bed1-bf51-4c01-b715-466dfbabf6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_12b6bed1-bf51-4c01-b715-466dfbabf6b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_d8e8cf0c-9c5d-4921-8b56-2fe75fc09ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_d8e8cf0c-9c5d-4921-8b56-2fe75fc09ff3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_7e3602c3-1aee-4fbd-b0b3-d9132bac2455" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_7e3602c3-1aee-4fbd-b0b3-d9132bac2455" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_b7901a23-1f73-4ffe-8ca3-e408b927afce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_b7901a23-1f73-4ffe-8ca3-e408b927afce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_14865ab9-87f5-4684-81da-20c4b03e58e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_ShareBasedCompensation_14865ab9-87f5-4684-81da-20c4b03e58e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_8411940e-a604-4d21-8732-546cdf9c9145" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_8411940e-a604-4d21-8732-546cdf9c9145" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9e95c7e8-c4f1-4756-9281-37bdbb414fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a03abcff-2317-497d-9d12-c6bbb0023336" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_9e95c7e8-c4f1-4756-9281-37bdbb414fb2" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/EmployeeBenefitPlansPensionPlansDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#EmployeeBenefitPlansPensionPlansDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/EmployeeBenefitPlansPensionPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_00804bc5-e1f9-42c5-b1be-211330e90d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a6c2060c-56dd-41f8-b08a-7a784812b3e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_00804bc5-e1f9-42c5-b1be-211330e90d3f" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a6c2060c-56dd-41f8-b08a-7a784812b3e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_ae0942b7-2606-462f-bdac-5212c0ffc483" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a6c2060c-56dd-41f8-b08a-7a784812b3e4" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_ae0942b7-2606-462f-bdac-5212c0ffc483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_ae0942b7-2606-462f-bdac-5212c0ffc483_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_ae0942b7-2606-462f-bdac-5212c0ffc483" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_ae0942b7-2606-462f-bdac-5212c0ffc483_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_4089d5a5-2101-415a-9fc2-95800c6b9ebf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_ae0942b7-2606-462f-bdac-5212c0ffc483" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_4089d5a5-2101-415a-9fc2-95800c6b9ebf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_7573e587-5cf3-4f35-b7fb-20d545a683dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_4089d5a5-2101-415a-9fc2-95800c6b9ebf" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_7573e587-5cf3-4f35-b7fb-20d545a683dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DefinedBenefitPlanConsecutiveMonthswithHighestCompensationinwhichBenefitsareBased_a9769aa7-a158-42e8-81d4-fc16b44d0f81" xlink:href="fnf-20251231.xsd#fnf_DefinedBenefitPlanConsecutiveMonthswithHighestCompensationinwhichBenefitsareBased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_00804bc5-e1f9-42c5-b1be-211330e90d3f" xlink:to="loc_fnf_DefinedBenefitPlanConsecutiveMonthswithHighestCompensationinwhichBenefitsareBased_a9769aa7-a158-42e8-81d4-fc16b44d0f81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DefinedBenefitPlanMonthsEndingatRetirementorTerminationinwhichBenefitsareBased_638817b0-b7cf-42d0-a572-80d5212f9da3" xlink:href="fnf-20251231.xsd#fnf_DefinedBenefitPlanMonthsEndingatRetirementorTerminationinwhichBenefitsareBased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_00804bc5-e1f9-42c5-b1be-211330e90d3f" xlink:to="loc_fnf_DefinedBenefitPlanMonthsEndingatRetirementorTerminationinwhichBenefitsareBased_638817b0-b7cf-42d0-a572-80d5212f9da3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_31e3ee6d-1acf-4b49-a7ac-0d0cb9b33855" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_00804bc5-e1f9-42c5-b1be-211330e90d3f" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_31e3ee6d-1acf-4b49-a7ac-0d0cb9b33855" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_b78891dc-cab9-4647-b082-4e016e59c8c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_00804bc5-e1f9-42c5-b1be-211330e90d3f" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_b78891dc-cab9-4647-b082-4e016e59c8c9" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FinancialInstrumentswithOffBalanceSheetRiskandConcentrationofRiskDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FinancialInstrumentswithOffBalanceSheetRiskandConcentrationofRiskDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FinancialInstrumentswithOffBalanceSheetRiskandConcentrationofRiskDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_6929fb89-8164-4660-86dc-6a66ab263c73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_f18ee8e5-5130-4a43-9f38-67ad0fbd5026" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_6929fb89-8164-4660-86dc-6a66ab263c73" xlink:to="loc_us-gaap_ConcentrationRiskTable_f18ee8e5-5130-4a43-9f38-67ad0fbd5026" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_afe6cb08-fd0b-451c-ac77-c451f0218aef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_f18ee8e5-5130-4a43-9f38-67ad0fbd5026" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_afe6cb08-fd0b-451c-ac77-c451f0218aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_afe6cb08-fd0b-451c-ac77-c451f0218aef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_afe6cb08-fd0b-451c-ac77-c451f0218aef" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_afe6cb08-fd0b-451c-ac77-c451f0218aef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_1531fbad-d793-4099-90d4-67eadf71e528" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_afe6cb08-fd0b-451c-ac77-c451f0218aef" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_1531fbad-d793-4099-90d4-67eadf71e528" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_6f8fdfd7-1775-45a0-91db-259c50787e16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_1531fbad-d793-4099-90d4-67eadf71e528" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_6f8fdfd7-1775-45a0-91db-259c50787e16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_334decf1-3598-4a23-af0c-f23bf520da43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_f18ee8e5-5130-4a43-9f38-67ad0fbd5026" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_334decf1-3598-4a23-af0c-f23bf520da43" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_334decf1-3598-4a23-af0c-f23bf520da43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_334decf1-3598-4a23-af0c-f23bf520da43" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_334decf1-3598-4a23-af0c-f23bf520da43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_f7744793-a975-4e5e-8b7d-d8a420569680" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_334decf1-3598-4a23-af0c-f23bf520da43" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_f7744793-a975-4e5e-8b7d-d8a420569680" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TitleInsurancePremiumsMember_5b8312ed-58b6-45b8-b04b-df07a50acc22" xlink:href="fnf-20251231.xsd#fnf_TitleInsurancePremiumsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_f7744793-a975-4e5e-8b7d-d8a420569680" xlink:to="loc_fnf_TitleInsurancePremiumsMember_5b8312ed-58b6-45b8-b04b-df07a50acc22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_0e43b991-dd9d-4ce3-ad73-05ffd50b071a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_f18ee8e5-5130-4a43-9f38-67ad0fbd5026" xlink:to="loc_srt_StatementGeographicalAxis_0e43b991-dd9d-4ce3-ad73-05ffd50b071a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_0e43b991-dd9d-4ce3-ad73-05ffd50b071a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_0e43b991-dd9d-4ce3-ad73-05ffd50b071a" xlink:to="loc_srt_SegmentGeographicalDomain_0e43b991-dd9d-4ce3-ad73-05ffd50b071a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_0e43b991-dd9d-4ce3-ad73-05ffd50b071a" xlink:to="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_TX_2d2f7238-f9bc-4be0-b692-9ff95a757707" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_TX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:to="loc_stpr_TX_2d2f7238-f9bc-4be0-b692-9ff95a757707" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_8b1e9ffa-adea-4d92-bf6b-2445d2ea07a6" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:to="loc_stpr_CA_8b1e9ffa-adea-4d92-bf6b-2445d2ea07a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_FL_030ca1d5-5b61-43fa-848d-c07058ee637c" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_FL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:to="loc_stpr_FL_030ca1d5-5b61-43fa-848d-c07058ee637c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_IL_17de9e72-61ba-4718-b1ef-34ff9711c0c1" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:to="loc_stpr_IL_17de9e72-61ba-4718-b1ef-34ff9711c0c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_PA_86ec4727-57df-483d-9801-d91e5e121365" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_PA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_aba70f69-eab6-45a5-a551-784b71038e06" xlink:to="loc_stpr_PA_86ec4727-57df-483d-9801-d91e5e121365" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_810c823d-9c71-4d11-8927-800262fdbfd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_6929fb89-8164-4660-86dc-6a66ab263c73" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_810c823d-9c71-4d11-8927-800262fdbfd6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/MarketRiskBenefitsScheduleofBalancesandChangesinMarketRiskBenefitDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#MarketRiskBenefitsScheduleofBalancesandChangesinMarketRiskBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/MarketRiskBenefitsScheduleofBalancesandChangesinMarketRiskBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_41d03bd2-2ab1-487a-9552-1fc098d1dd9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_2830332f-4fb4-4ade-a3c7-9d470fbabeef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_41d03bd2-2ab1-487a-9552-1fc098d1dd9c" xlink:to="loc_us-gaap_MarketRiskBenefitTable_2830332f-4fb4-4ade-a3c7-9d470fbabeef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_fee89dff-34d6-4931-a1b6-f4c856caa2c0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_2830332f-4fb4-4ade-a3c7-9d470fbabeef" xlink:to="loc_srt_ProductOrServiceAxis_fee89dff-34d6-4931-a1b6-f4c856caa2c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_fee89dff-34d6-4931-a1b6-f4c856caa2c0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_fee89dff-34d6-4931-a1b6-f4c856caa2c0" xlink:to="loc_srt_ProductsAndServicesDomain_fee89dff-34d6-4931-a1b6-f4c856caa2c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f49b6cb1-a13a-4381-96a4-a02c21698ee6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_fee89dff-34d6-4931-a1b6-f4c856caa2c0" xlink:to="loc_srt_ProductsAndServicesDomain_f49b6cb1-a13a-4381-96a4-a02c21698ee6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_21f413b5-1ed4-4733-a372-c136a74bdd64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f49b6cb1-a13a-4381-96a4-a02c21698ee6" xlink:to="loc_us-gaap_IndexedAnnuityMember_21f413b5-1ed4-4733-a372-c136a74bdd64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_5d18c59c-7278-43e2-b6bb-4e6c4628559e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f49b6cb1-a13a-4381-96a4-a02c21698ee6" xlink:to="loc_us-gaap_FixedAnnuityMember_5d18c59c-7278-43e2-b6bb-4e6c4628559e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_41d03bd2-2ab1-487a-9552-1fc098d1dd9c" xlink:to="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_80bd2c58-78b6-4b68-8560-4322a74c54a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_80bd2c58-78b6-4b68-8560-4322a74c54a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:to="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitIssuanceAndBenefitPayments_d2675b3f-b712-4cfd-b5f9-15e562d7cbc9" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitIssuanceAndBenefitPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:to="loc_fnf_MarketRiskBenefitIssuanceAndBenefitPayments_d2675b3f-b712-4cfd-b5f9-15e562d7cbc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_1e7aef10-1701-4346-afbb-5eb8210a9ef3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAttributedFeeCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:to="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_1e7aef10-1701-4346-afbb-5eb8210a9ef3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected_476b6557-8ade-4c0d-9607-59303ac566a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected_476b6557-8ade-4c0d-9607-59303ac566a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromOtherAssumption_0903227a-982f-402b-9aac-873bca81a8fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromOtherAssumption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromOtherAssumption_0903227a-982f-402b-9aac-873bca81a8fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_5beb4e95-0bc6-4ebd-9385-c0bf26d15e77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_5365873c-a5b5-4dbc-ad04-3454b6e3aedc" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_5beb4e95-0bc6-4ebd-9385-c0bf26d15e77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_21e36b30-a871-4a76-a38a-7e0438734b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_b9e6832e-2c0b-4eda-bb41-2e20244dea9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_b9e6832e-2c0b-4eda-bb41-2e20244dea9c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_cd71d993-0cbc-4f18-9c11-32c86cc282e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_d48645fb-e717-4db4-8f3f-e30644ec04cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:to="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_d48645fb-e717-4db4-8f3f-e30644ec04cc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_849b05bf-9af4-40fd-9765-5e147b3286f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitRollForward_019b2e61-80ee-7366-992c-509e26e4ad8c" xlink:to="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_849b05bf-9af4-40fd-9765-5e147b3286f7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAgeOfPolicyholdersWeightedByTotalAV_6438654f-af36-4175-a0af-8658c14e5bc5" xlink:href="fnf-20251231.xsd#fnf_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAgeOfPolicyholdersWeightedByTotalAV"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_41d03bd2-2ab1-487a-9552-1fc098d1dd9c" xlink:to="loc_fnf_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAgeOfPolicyholdersWeightedByTotalAV_6438654f-af36-4175-a0af-8658c14e5bc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitNetAmountAtRisk_c781a0a9-8f25-4803-963d-c9f8a235c711" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_41d03bd2-2ab1-487a-9552-1fc098d1dd9c" xlink:to="loc_us-gaap_MarketRiskBenefitNetAmountAtRisk_c781a0a9-8f25-4803-963d-c9f8a235c711" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/MarketRiskBenefitsScheduleofReconciliationofAssetandLiabilityDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#MarketRiskBenefitsScheduleofReconciliationofAssetandLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/MarketRiskBenefitsScheduleofReconciliationofAssetandLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_f60db1ae-5510-4591-a2fa-cacacc9560a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_5600982c-d125-4900-85bd-346c117f0582" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_f60db1ae-5510-4591-a2fa-cacacc9560a0" xlink:to="loc_us-gaap_MarketRiskBenefitTable_5600982c-d125-4900-85bd-346c117f0582" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_9a34748f-f2cb-4de5-bd33-aaa222b9af6a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_5600982c-d125-4900-85bd-346c117f0582" xlink:to="loc_srt_ProductOrServiceAxis_9a34748f-f2cb-4de5-bd33-aaa222b9af6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9a34748f-f2cb-4de5-bd33-aaa222b9af6a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_9a34748f-f2cb-4de5-bd33-aaa222b9af6a" xlink:to="loc_srt_ProductsAndServicesDomain_9a34748f-f2cb-4de5-bd33-aaa222b9af6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8aa30f89-eae5-432e-be13-60e32eedc23a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_9a34748f-f2cb-4de5-bd33-aaa222b9af6a" xlink:to="loc_srt_ProductsAndServicesDomain_8aa30f89-eae5-432e-be13-60e32eedc23a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_79c1d32a-c8c2-417a-a006-7e4d8747487b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8aa30f89-eae5-432e-be13-60e32eedc23a" xlink:to="loc_us-gaap_IndexedAnnuityMember_79c1d32a-c8c2-417a-a006-7e4d8747487b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_9bb1deca-4e68-443d-be38-0bb48a1ee498" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8aa30f89-eae5-432e-be13-60e32eedc23a" xlink:to="loc_us-gaap_FixedAnnuityMember_9bb1deca-4e68-443d-be38-0bb48a1ee498" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitTypeAxis_9ee26eca-47ff-4f01-b0da-8c758f39d855" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_5600982c-d125-4900-85bd-346c117f0582" xlink:to="loc_fnf_MarketRiskBenefitTypeAxis_9ee26eca-47ff-4f01-b0da-8c758f39d855" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitTypeDomain_9ee26eca-47ff-4f01-b0da-8c758f39d855_default" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fnf_MarketRiskBenefitTypeAxis_9ee26eca-47ff-4f01-b0da-8c758f39d855" xlink:to="loc_fnf_MarketRiskBenefitTypeDomain_9ee26eca-47ff-4f01-b0da-8c758f39d855_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_MarketRiskBenefitTypeDomain_52a57db2-fc60-491f-9d95-83690f9eba1f" xlink:href="fnf-20251231.xsd#fnf_MarketRiskBenefitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fnf_MarketRiskBenefitTypeAxis_9ee26eca-47ff-4f01-b0da-8c758f39d855" xlink:to="loc_fnf_MarketRiskBenefitTypeDomain_52a57db2-fc60-491f-9d95-83690f9eba1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DirectMember_82fe1b8e-9834-443f-9a2b-f31064266e53" xlink:href="fnf-20251231.xsd#fnf_DirectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_MarketRiskBenefitTypeDomain_52a57db2-fc60-491f-9d95-83690f9eba1f" xlink:to="loc_fnf_DirectMember_82fe1b8e-9834-443f-9a2b-f31064266e53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ReinsuredMember_4fbcea44-e1a9-46b2-9d94-ba03a1e8704b" xlink:href="fnf-20251231.xsd#fnf_ReinsuredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_MarketRiskBenefitTypeDomain_52a57db2-fc60-491f-9d95-83690f9eba1f" xlink:to="loc_fnf_ReinsuredMember_4fbcea44-e1a9-46b2-9d94-ba03a1e8704b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_4f7079b2-755f-4b9c-b3d5-311da497f7df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_f60db1ae-5510-4591-a2fa-cacacc9560a0" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_4f7079b2-755f-4b9c-b3d5-311da497f7df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_9943531e-b84b-4f4f-b0c5-885914ed4b85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_f60db1ae-5510-4591-a2fa-cacacc9560a0" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_9943531e-b84b-4f4f-b0c5-885914ed4b85" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ContractholderFundsBalancesandChangesinContractholderFundsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ContractholderFundsBalancesandChangesinContractholderFundsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ContractholderFundsBalancesandChangesinContractholderFundsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_4a6ca5a6-7803-4880-ab16-9141ddcc7d54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_3a7e0bbe-9800-4a70-a81c-a19b8d9636d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_4a6ca5a6-7803-4880-ab16-9141ddcc7d54" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_3a7e0bbe-9800-4a70-a81c-a19b8d9636d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_40f4d322-a298-4d9c-bff5-a81260becd0a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_3a7e0bbe-9800-4a70-a81c-a19b8d9636d7" xlink:to="loc_srt_ProductOrServiceAxis_40f4d322-a298-4d9c-bff5-a81260becd0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_40f4d322-a298-4d9c-bff5-a81260becd0a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_40f4d322-a298-4d9c-bff5-a81260becd0a" xlink:to="loc_srt_ProductsAndServicesDomain_40f4d322-a298-4d9c-bff5-a81260becd0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_40f4d322-a298-4d9c-bff5-a81260becd0a" xlink:to="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_bc87738b-f7df-43dc-9b4a-7c056817f221" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:to="loc_us-gaap_IndexedAnnuityMember_bc87738b-f7df-43dc-9b4a-7c056817f221" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_4f253928-c3c6-45ae-96c5-54346b9cccaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:to="loc_us-gaap_FixedAnnuityMember_4f253928-c3c6-45ae-96c5-54346b9cccaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_e97c05cd-84bd-440b-a42c-b1e68ef53f13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:to="loc_us-gaap_UniversalLifeMember_e97c05cd-84bd-440b-a42c-b1e68ef53f13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundingAgreementsFABNMember_99566993-664d-438e-824a-4035bad0823a" xlink:href="fnf-20251231.xsd#fnf_FundingAgreementsFABNMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:to="loc_fnf_FundingAgreementsFABNMember_99566993-664d-438e-824a-4035bad0823a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundingAgreementsFederalHomeLoanBankMember_839a3458-cb26-450d-b657-46413646da1e" xlink:href="fnf-20251231.xsd#fnf_FundingAgreementsFederalHomeLoanBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_2f903dfe-4d8f-4d64-bc87-34fea42a6a57" xlink:to="loc_fnf_FundingAgreementsFederalHomeLoanBankMember_839a3458-cb26-450d-b657-46413646da1e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_4a6ca5a6-7803-4880-ab16-9141ddcc7d54" xlink:to="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIssuance_fe3f321f-a799-44c2-a58b-5ec4257ef6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIssuance_fe3f321f-a799-44c2-a58b-5ec4257ef6d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalancePremiumReceived_36c9919c-de9f-4342-a017-265ea1429b51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalancePremiumReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_PolicyholderAccountBalancePremiumReceived_36c9919c-de9f-4342-a017-265ea1429b51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_338a3cf4-cc49-419d-989e-f64f42614995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalancePolicyCharge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_338a3cf4-cc49-419d-989e-f64f42614995" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_6bd0f2f1-f957-41b8-bf36-7ef7e1ec1da3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_6bd0f2f1-f957-41b8-bf36-7ef7e1ec1da3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_ce445057-518e-4634-b6a6-52dec7b2efbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_ce445057-518e-4634-b6a6-52dec7b2efbf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_653f33f7-8017-4151-9167-9b96109b361e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestCreditedToPolicyholdersAccountBalances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_653f33f7-8017-4151-9167-9b96109b361e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_f29d1e87-a705-44f4-b6de-f18c734d0d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_ad5cf182-9129-4d1f-a4e7-d837e49c12a5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_f29d1e87-a705-44f4-b6de-f18c734d0d2e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_4f3360a6-54c4-4687-b2e1-90165e115194" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_aacbf016-db5b-40e0-a47e-bb99744a35c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_aacbf016-db5b-40e0-a47e-bb99744a35c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyHolderAccountBalanceGrossLiability_0c4b7198-4a66-46fa-beb3-e3133d26ed9f" xlink:href="fnf-20251231.xsd#fnf_PolicyHolderAccountBalanceGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_fnf_PolicyHolderAccountBalanceGrossLiability_0c4b7198-4a66-46fa-beb3-e3133d26ed9f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_5ce94bbc-c2b3-4409-a7db-a6610d1f082c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_us-gaap_ReinsuranceRecoverables_5ce94bbc-c2b3-4409-a7db-a6610d1f082c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceNetOfDepositAsset_676d3d14-ef7e-4212-9f9e-eecc6160676e" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceNetOfDepositAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_fnf_PolicyholderAccountBalanceNetOfDepositAsset_676d3d14-ef7e-4212-9f9e-eecc6160676e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_c798db2c-ec98-43d8-936b-58ca20612d05" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_c798db2c-ec98-43d8-936b-58ca20612d05" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_c1a888f0-9bdc-43e8-b281-ebc754e935a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_c1a888f0-9bdc-43e8-b281-ebc754e935a6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_c676e971-0681-4679-af5f-9219acd79090" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashSurrenderValueDuePolicyholdersAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_5fbf6fde-cb86-46ae-9375-8d4cfaf206d5" xlink:to="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_c676e971-0681-4679-af5f-9219acd79090" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ContractholderFundsReconciliationtoCondensedConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ContractholderFundsReconciliationtoCondensedConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ContractholderFundsReconciliationtoCondensedConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_d01bb772-0c59-4ff3-ab0a-622dd44e5196" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_2ae24c67-71b0-4407-a200-72273271dd1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_d01bb772-0c59-4ff3-ab0a-622dd44e5196" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_2ae24c67-71b0-4407-a200-72273271dd1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e3e6d598-b283-4a40-814f-14ee0fd71937" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_2ae24c67-71b0-4407-a200-72273271dd1c" xlink:to="loc_srt_ProductOrServiceAxis_e3e6d598-b283-4a40-814f-14ee0fd71937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e3e6d598-b283-4a40-814f-14ee0fd71937_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_e3e6d598-b283-4a40-814f-14ee0fd71937" xlink:to="loc_srt_ProductsAndServicesDomain_e3e6d598-b283-4a40-814f-14ee0fd71937_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_e3e6d598-b283-4a40-814f-14ee0fd71937" xlink:to="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_eb8a05a8-3129-49d9-86c2-90b00789aa6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_us-gaap_IndexedAnnuityMember_eb8a05a8-3129-49d9-86c2-90b00789aa6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_6102eb73-4e35-4b22-b2f6-08f2eea29cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_us-gaap_FixedAnnuityMember_6102eb73-4e35-4b22-b2f6-08f2eea29cc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_7fd5430d-035b-4cfb-b792-f4a05155f8fd" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_fnf_ImmediateAnnuityMember_7fd5430d-035b-4cfb-b792-f4a05155f8fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_11204303-7f86-41d4-833b-908b087e1f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_us-gaap_UniversalLifeMember_11204303-7f86-41d4-833b-908b087e1f7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_a2c569d1-bcf2-4091-af39-3e16c8caad09" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_a2c569d1-bcf2-4091-af39-3e16c8caad09" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundingAgreementsFABNMember_59c621db-7e0b-4265-8cbc-86963c2a7f75" xlink:href="fnf-20251231.xsd#fnf_FundingAgreementsFABNMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_fnf_FundingAgreementsFABNMember_59c621db-7e0b-4265-8cbc-86963c2a7f75" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FundingAgreementsFederalHomeLoanBankMember_f7f0f8e1-0a7d-439f-9be3-f125837f75a9" xlink:href="fnf-20251231.xsd#fnf_FundingAgreementsFederalHomeLoanBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_fnf_FundingAgreementsFederalHomeLoanBankMember_f7f0f8e1-0a7d-439f-9be3-f125837f75a9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PRTMember_601bbcfa-7332-4706-ac3f-e904a9e916d9" xlink:href="fnf-20251231.xsd#fnf_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_08c8a2a0-721c-439e-bbf8-10448a7295e8" xlink:to="loc_fnf_PRTMember_601bbcfa-7332-4706-ac3f-e904a9e916d9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyHolderAccountBalanceGrossLiability_c116a53d-16e1-40ff-a959-8d22c6859d5f" xlink:href="fnf-20251231.xsd#fnf_PolicyHolderAccountBalanceGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_d01bb772-0c59-4ff3-ab0a-622dd44e5196" xlink:to="loc_fnf_PolicyHolderAccountBalanceGrossLiability_c116a53d-16e1-40ff-a959-8d22c6859d5f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ContractholderFundsAccountValuesbyRangeofGuaranteedMinimumCreditRatingDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ContractholderFundsAccountValuesbyRangeofGuaranteedMinimumCreditRatingDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ContractholderFundsAccountValuesbyRangeofGuaranteedMinimumCreditRatingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_5e70e7d7-10d1-40da-9e28-b5d0a8de6c06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_24ceccbc-e69a-4a49-9bd7-bb16f0196af4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_5e70e7d7-10d1-40da-9e28-b5d0a8de6c06" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_24ceccbc-e69a-4a49-9bd7-bb16f0196af4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_a1d54775-9268-4252-a600-19868aaa8b75" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_24ceccbc-e69a-4a49-9bd7-bb16f0196af4" xlink:to="loc_srt_RangeAxis_a1d54775-9268-4252-a600-19868aaa8b75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a1d54775-9268-4252-a600-19868aaa8b75_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_a1d54775-9268-4252-a600-19868aaa8b75" xlink:to="loc_srt_RangeMember_a1d54775-9268-4252-a600-19868aaa8b75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ffbcfdef-208d-4d43-ae41-2006e434cd73" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_a1d54775-9268-4252-a600-19868aaa8b75" xlink:to="loc_srt_RangeMember_ffbcfdef-208d-4d43-ae41-2006e434cd73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_114c07af-0627-499a-82f2-48f48fc59146" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ffbcfdef-208d-4d43-ae41-2006e434cd73" xlink:to="loc_srt_MinimumMember_114c07af-0627-499a-82f2-48f48fc59146" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9402fb45-2350-4706-b3ab-35f5f0cc1dd3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ffbcfdef-208d-4d43-ae41-2006e434cd73" xlink:to="loc_srt_MaximumMember_9402fb45-2350-4706-b3ab-35f5f0cc1dd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7fa1b20f-dcbe-41b3-b5a4-91edbd322cfe" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_24ceccbc-e69a-4a49-9bd7-bb16f0196af4" xlink:to="loc_srt_ProductOrServiceAxis_7fa1b20f-dcbe-41b3-b5a4-91edbd322cfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7fa1b20f-dcbe-41b3-b5a4-91edbd322cfe_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7fa1b20f-dcbe-41b3-b5a4-91edbd322cfe" xlink:to="loc_srt_ProductsAndServicesDomain_7fa1b20f-dcbe-41b3-b5a4-91edbd322cfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_0d36e7a2-21e0-49b4-8081-a388d4e8dd13" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7fa1b20f-dcbe-41b3-b5a4-91edbd322cfe" xlink:to="loc_srt_ProductsAndServicesDomain_0d36e7a2-21e0-49b4-8081-a388d4e8dd13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_daf9bb1c-b6ed-47ae-8306-e4e9646c4b76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0d36e7a2-21e0-49b4-8081-a388d4e8dd13" xlink:to="loc_us-gaap_IndexedAnnuityMember_daf9bb1c-b6ed-47ae-8306-e4e9646c4b76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_fb809437-35a0-4eaa-83d9-8cd1cc8ae44f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0d36e7a2-21e0-49b4-8081-a388d4e8dd13" xlink:to="loc_us-gaap_FixedAnnuityMember_fb809437-35a0-4eaa-83d9-8cd1cc8ae44f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_f1f1fce4-3941-49d0-9884-0d18f0860b88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_0d36e7a2-21e0-49b4-8081-a388d4e8dd13" xlink:to="loc_us-gaap_UniversalLifeMember_f1f1fce4-3941-49d0-9884-0d18f0860b88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_b1be9f9d-fd3d-4e78-b6db-3c38d450c100" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_24ceccbc-e69a-4a49-9bd7-bb16f0196af4" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_b1be9f9d-fd3d-4e78-b6db-3c38d450c100" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_b1be9f9d-fd3d-4e78-b6db-3c38d450c100_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_b1be9f9d-fd3d-4e78-b6db-3c38d450c100" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_b1be9f9d-fd3d-4e78-b6db-3c38d450c100_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_01ab8942-51aa-446f-9d58-b289db067c84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_b1be9f9d-fd3d-4e78-b6db-3c38d450c100" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_01ab8942-51aa-446f-9d58-b289db067c84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom000To150Member_c7ebbbe7-806a-4ccb-a510-115a432be7b6" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom000To150Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_01ab8942-51aa-446f-9d58-b289db067c84" xlink:to="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom000To150Member_c7ebbbe7-806a-4ccb-a510-115a432be7b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom151To250Member_40139c1d-6dca-49ba-a43c-f1faf80ea024" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom151To250Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_01ab8942-51aa-446f-9d58-b289db067c84" xlink:to="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom151To250Member_40139c1d-6dca-49ba-a43c-f1faf80ea024" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeGreaterThan250Member_0ae1b060-01cd-4b2b-a757-e5bc2140c505" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeGreaterThan250Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_01ab8942-51aa-446f-9d58-b289db067c84" xlink:to="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeGreaterThan250Member_0ae1b060-01cd-4b2b-a757-e5bc2140c505" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_294576ca-0648-4fde-906c-3bf25dc30be2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_24ceccbc-e69a-4a49-9bd7-bb16f0196af4" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_294576ca-0648-4fde-906c-3bf25dc30be2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_294576ca-0648-4fde-906c-3bf25dc30be2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_294576ca-0648-4fde-906c-3bf25dc30be2" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_294576ca-0648-4fde-906c-3bf25dc30be2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_3ae10289-571d-4f24-b0ac-36b23df90f74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_294576ca-0648-4fde-906c-3bf25dc30be2" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_3ae10289-571d-4f24-b0ac-36b23df90f74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_a6cf6bf5-3aab-40ab-99cf-eadf2882c7cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_3ae10289-571d-4f24-b0ac-36b23df90f74" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_a6cf6bf5-3aab-40ab-99cf-eadf2882c7cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member_a5696948-e4cc-469f-b1d5-ea34b4566432" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_3ae10289-571d-4f24-b0ac-36b23df90f74" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member_a5696948-e4cc-469f-b1d5-ea34b4566432" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member_217f9d0a-4c27-4b79-a693-55b9be492098" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_3ae10289-571d-4f24-b0ac-36b23df90f74" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member_217f9d0a-4c27-4b79-a693-55b9be492098" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateGreaterThan0150Member_f759ec40-d269-4940-bf27-03f841782e1e" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateGreaterThan0150Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_3ae10289-571d-4f24-b0ac-36b23df90f74" xlink:to="loc_fnf_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateGreaterThan0150Member_f759ec40-d269-4940-bf27-03f841782e1e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_50665cdd-9a4f-49a5-8192-c38c049ecea8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_5e70e7d7-10d1-40da-9e28-b5d0a8de6c06" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_50665cdd-9a4f-49a5-8192-c38c049ecea8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_b2694566-eb51-4a01-bd58-65ef20758b2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_5e70e7d7-10d1-40da-9e28-b5d0a8de6c06" xlink:to="loc_us-gaap_PolicyholderFunds_b2694566-eb51-4a01-bd58-65ef20758b2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceWithNoGuaranteedMinimumCreditingRate_019ba297-fc03-711b-bde3-051efbb441f5" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceWithNoGuaranteedMinimumCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_5e70e7d7-10d1-40da-9e28-b5d0a8de6c06" xlink:to="loc_fnf_PolicyholderAccountBalanceWithNoGuaranteedMinimumCreditingRate_019ba297-fc03-711b-bde3-051efbb441f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019ba297-fc03-70dc-abbc-9aca63708229" xlink:href="fnf-20251231.xsd#fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_5e70e7d7-10d1-40da-9e28-b5d0a8de6c06" xlink:to="loc_fnf_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019ba297-fc03-70dc-abbc-9aca63708229" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsChangesinthePresentValueofExpectedNetPremiumsandPresentValueDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsChangesinthePresentValueofExpectedNetPremiumsandPresentValueDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsChangesinthePresentValueofExpectedNetPremiumsandPresentValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-1af7-703b-9923-d989b2b0a1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-1af7-7a46-ba92-4dae8fe4f92e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-1af7-703b-9923-d989b2b0a1a4" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-1af7-7a46-ba92-4dae8fe4f92e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-1af7-7399-a643-147c8d6a4b96" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-1af7-7a46-ba92-4dae8fe4f92e" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-1af7-7399-a643-147c8d6a4b96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7399-a643-147c8d6a4b96_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-1af7-7399-a643-147c8d6a4b96" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7399-a643-147c8d6a4b96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7a80-9e56-4a000a56b1b6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-1af7-7399-a643-147c8d6a4b96" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7a80-9e56-4a000a56b1b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-1af7-72b1-8e6e-f6bc903b36a4" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7a80-9e56-4a000a56b1b6" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-1af7-72b1-8e6e-f6bc903b36a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PensionRiskTransfersMember_019b2e8d-1af7-7781-96d9-893dcea83c24" xlink:href="fnf-20251231.xsd#fnf_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7a80-9e56-4a000a56b1b6" xlink:to="loc_fnf_PensionRiskTransfersMember_019b2e8d-1af7-7781-96d9-893dcea83c24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-1af7-71ef-8bc3-acd83c94983a" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-1af7-7a80-9e56-4a000a56b1b6" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-1af7-71ef-8bc3-acd83c94983a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019b2e8d-1af7-72e9-af56-9c8c11865488" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-1af7-703b-9923-d989b2b0a1a4" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019b2e8d-1af7-72e9-af56-9c8c11865488" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019b2e8d-1af7-7d92-984d-56e11d597ea9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019b2e8d-1af7-72e9-af56-9c8c11865488" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019b2e8d-1af7-7d92-984d-56e11d597ea9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af7-74fc-bc0e-e3ecfcf092f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019b2e8d-1af7-72e9-af56-9c8c11865488" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af7-74fc-bc0e-e3ecfcf092f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019b2e8d-1af7-7819-b9f7-7ed012dee8fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af7-74fc-bc0e-e3ecfcf092f1" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019b2e8d-1af7-7819-b9f7-7ed012dee8fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-71fe-86ce-6724f88374ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019b2e8d-1af7-72e9-af56-9c8c11865488" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-71fe-86ce-6724f88374ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019b2e8d-1af8-7fd6-b61d-3820f16b94b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-71fe-86ce-6724f88374ba" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019b2e8d-1af8-7fd6-b61d-3820f16b94b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019b2e8d-1af8-79d6-a04f-c0811f58f85b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-71fe-86ce-6724f88374ba" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019b2e8d-1af8-79d6-a04f-c0811f58f85b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7a99-a608-20bf59126236" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019b2e8d-1af8-7729-b5e1-4517d2966e5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019b2e8d-1af7-72e9-af56-9c8c11865488" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019b2e8d-1af8-7729-b5e1-4517d2966e5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019b2e8d-1af8-7498-b640-673326de2b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-1af7-703b-9923-d989b2b0a1a4" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019b2e8d-1af8-74b2-a040-2703544150d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019b2e8d-1af8-74b2-a040-2703544150d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7266-b893-5e1f7502d469" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7266-b893-5e1f7502d469" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange_019b2e8d-1af8-7b11-8364-1953d802a392" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7266-b893-5e1f7502d469" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange_019b2e8d-1af8-7b11-8364-1953d802a392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019b2e8d-1af8-79d4-8c28-b36557223010" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7266-b893-5e1f7502d469" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019b2e8d-1af8-79d4-8c28-b36557223010" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-7dbd-b957-cc697e6f1d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7266-b893-5e1f7502d469" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-7dbd-b957-cc697e6f1d5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019b2e8d-1af8-705f-8a7b-24a11189ba2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-7dbd-b957-cc697e6f1d5c" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019b2e8d-1af8-705f-8a7b-24a11189ba2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019b2e8d-1af8-737a-801d-9bc4afc778df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-7dbd-b957-cc697e6f1d5c" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019b2e8d-1af8-737a-801d-9bc4afc778df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019b2e8d-1af8-7a67-8b58-db05be917013" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019b2e8d-1af8-7dbd-b957-cc697e6f1d5c" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019b2e8d-1af8-7a67-8b58-db05be917013" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019b2e8d-1af8-7a00-9b40-608204fc1889" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019b2e8d-1af8-76e4-86fe-d8877d203488" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019b2e8d-1af8-76e4-86fe-d8877d203488" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019b2e8d-1af8-7b9f-977a-0409e7e7968e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019b2e8d-1af8-7501-85a0-9cbf9169edfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019b2e8d-1af8-7501-85a0-9cbf9169edfc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance_019b2e8d-1af8-7932-bd1b-7d03dd9ffb54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance_019b2e8d-1af8-7932-bd1b-7d03dd9ffb54" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance_019b2e8d-1af8-73e2-9860-8f062e38411d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance_019b2e8d-1af8-73e2-9860-8f062e38411d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019b2e8d-1af8-73e1-ae76-25e6c3620c8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019b2e8d-1af8-7ee8-ab67-d059586ff6d0" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019b2e8d-1af8-73e1-ae76-25e6c3620c8e" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsBalancesandChangesintheDeferredProfitLiabilityDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsBalancesandChangesintheDeferredProfitLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsBalancesandChangesintheDeferredProfitLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-3726-7f4d-9864-f5220f5b7f85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-3726-7d02-b37d-aec84b33a21e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-3726-7f4d-9864-f5220f5b7f85" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-3726-7d02-b37d-aec84b33a21e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-3726-7db5-b39f-adead1210568" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-3726-7d02-b37d-aec84b33a21e" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-3726-7db5-b39f-adead1210568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-3726-7db5-b39f-adead1210568_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-3726-7db5-b39f-adead1210568" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-3726-7db5-b39f-adead1210568_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-3726-7ba4-b82e-b388ae0ff3b8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-3726-7db5-b39f-adead1210568" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-3726-7ba4-b82e-b388ae0ff3b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-3726-7f08-8c2f-ba8ce08690df" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-3726-7ba4-b82e-b388ae0ff3b8" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-3726-7f08-8c2f-ba8ce08690df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PensionRiskTransfersMember_019b2e8d-3726-798c-adf8-04b7518b51b5" xlink:href="fnf-20251231.xsd#fnf_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-3726-7ba4-b82e-b388ae0ff3b8" xlink:to="loc_fnf_PensionRiskTransfersMember_019b2e8d-3726-798c-adf8-04b7518b51b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityRollforwardRollForward_019b2e8d-3726-7ed2-8420-a245c985591c" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityRollforwardRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-3726-7f4d-9864-f5220f5b7f85" xlink:to="loc_fnf_DeferredProfitLiabilityRollforwardRollForward_019b2e8d-3726-7ed2-8420-a245c985591c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiability_019b2e8d-3726-7515-8def-cf0bd738b8a7" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiabilityRollforwardRollForward_019b2e8d-3726-7ed2-8420-a245c985591c" xlink:to="loc_fnf_DeferredProfitLiability_019b2e8d-3726-7515-8def-cf0bd738b8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityEffectOfChangesInCashFlowAssumptions_019b2e8d-3726-78c4-861d-3426eaf8165f" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityEffectOfChangesInCashFlowAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiability_019b2e8d-3726-7515-8def-cf0bd738b8a7" xlink:to="loc_fnf_DeferredProfitLiabilityEffectOfChangesInCashFlowAssumptions_019b2e8d-3726-78c4-861d-3426eaf8165f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019b2e8d-3726-792c-8455-205dae6a7ad0" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiability_019b2e8d-3726-7515-8def-cf0bd738b8a7" xlink:to="loc_fnf_DeferredProfitLiabilityCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019b2e8d-3726-792c-8455-205dae6a7ad0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019b2e8d-3726-7f79-bbdd-f44d96f21d87" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiabilityRollforwardRollForward_019b2e8d-3726-7ed2-8420-a245c985591c" xlink:to="loc_fnf_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019b2e8d-3726-7f79-bbdd-f44d96f21d87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityIssuance_019b2e8d-3726-7611-94b7-16ca75427598" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019b2e8d-3726-7f79-bbdd-f44d96f21d87" xlink:to="loc_fnf_DeferredProfitLiabilityIssuance_019b2e8d-3726-7611-94b7-16ca75427598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityInterestExpense_019b2e8d-3726-7f2e-8c9b-f7f6a6081d08" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019b2e8d-3726-7f79-bbdd-f44d96f21d87" xlink:to="loc_fnf_DeferredProfitLiabilityInterestExpense_019b2e8d-3726-7f2e-8c9b-f7f6a6081d08" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiabilityAmortization_019b2e8d-3726-799e-b6eb-9a3551598cf9" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiabilityAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019b2e8d-3726-7f79-bbdd-f44d96f21d87" xlink:to="loc_fnf_DeferredProfitLiabilityAmortization_019b2e8d-3726-799e-b6eb-9a3551598cf9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiability_019b2e8d-3726-7ec3-8fbd-2d11a4b70e05" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiability"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsReconciliationofNetFPBtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsReconciliationofNetFPBtotheCondensedConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsReconciliationofNetFPBtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-5925-785d-84d2-b3e114263cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-5925-7d27-9d85-90c043935e31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-5925-785d-84d2-b3e114263cf3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-5925-7d27-9d85-90c043935e31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-5925-7507-88e7-f383543365fd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-5925-7d27-9d85-90c043935e31" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-5925-7507-88e7-f383543365fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-7507-88e7-f383543365fd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-5925-7507-88e7-f383543365fd" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-7507-88e7-f383543365fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-5925-7507-88e7-f383543365fd" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-5925-7349-8a79-aba78aff438d" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-5925-7349-8a79-aba78aff438d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-5925-7be5-b0b2-d178b1dbf437" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-5925-7be5-b0b2-d178b1dbf437" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PRTMember_019b2e8d-5925-7ffe-85d8-da63a3430731" xlink:href="fnf-20251231.xsd#fnf_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:to="loc_fnf_PRTMember_019b2e8d-5925-7ffe-85d8-da63a3430731" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityDeferredProfitLiabilityMember_019b2e8d-5925-705f-9432-4220802aebb7" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityDeferredProfitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:to="loc_fnf_ImmediateAnnuityDeferredProfitLiabilityMember_019b2e8d-5925-705f-9432-4220802aebb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PRTDeferredProfitLiabilityMember_019b2e8d-5925-7f65-8f29-ebd5e131cf7b" xlink:href="fnf-20251231.xsd#fnf_PRTDeferredProfitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-5925-71d7-aa07-a7e93c9860e2" xlink:to="loc_fnf_PRTDeferredProfitLiabilityMember_019b2e8d-5925-7f65-8f29-ebd5e131cf7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019b2e8d-5925-75a9-8cfa-f350b0449eda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-5925-785d-84d2-b3e114263cf3" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019b2e8d-5925-75a9-8cfa-f350b0449eda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_DeferredProfitLiability_019b2e8d-5925-7a4d-be8b-8a0431b90a9f" xlink:href="fnf-20251231.xsd#fnf_DeferredProfitLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-5925-785d-84d2-b3e114263cf3" xlink:to="loc_fnf_DeferredProfitLiability_019b2e8d-5925-7a4d-be8b-8a0431b90a9f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-79a6-7bf1-b275-b8c794e0c0fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-79a6-7926-99c2-554a1c50ac3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-79a6-7bf1-b275-b8c794e0c0fe" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-79a6-7926-99c2-554a1c50ac3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-79a6-7ab4-9988-7bc02c22de84" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-79a6-7926-99c2-554a1c50ac3a" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-79a6-7ab4-9988-7bc02c22de84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7ab4-9988-7bc02c22de84_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-79a6-7ab4-9988-7bc02c22de84" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7ab4-9988-7bc02c22de84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7493-b7f0-5ecd7525572f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-79a6-7ab4-9988-7bc02c22de84" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7493-b7f0-5ecd7525572f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-79a6-7010-8022-be79729faefc" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7493-b7f0-5ecd7525572f" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-79a6-7010-8022-be79729faefc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-79a6-7b5c-ba2d-86e3957b290c" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7493-b7f0-5ecd7525572f" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-79a6-7b5c-ba2d-86e3957b290c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PRTMember_019b2e8d-79a6-7539-b2c9-cf2a5ff079ab" xlink:href="fnf-20251231.xsd#fnf_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-79a6-7493-b7f0-5ecd7525572f" xlink:to="loc_fnf_PRTMember_019b2e8d-79a6-7539-b2c9-cf2a5ff079ab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019b2e8d-79a6-7043-b106-db4ab383ca36" xlink:href="fnf-20251231.xsd#fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-79a6-7bf1-b275-b8c794e0c0fe" xlink:to="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019b2e8d-79a6-7043-b106-db4ab383ca36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019b2e8d-79a6-7bbe-bdb0-078721c42c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019b2e8d-79a6-7043-b106-db4ab383ca36" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019b2e8d-79a6-7bbe-bdb0-078721c42c5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019b2e8d-79a6-70b1-8bff-b098489a46cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019b2e8d-79a6-7043-b106-db4ab383ca36" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019b2e8d-79a6-70b1-8bff-b098489a46cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019b2e8d-79a6-7701-8710-dfc82fc1c973" xlink:href="fnf-20251231.xsd#fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-79a6-7bf1-b275-b8c794e0c0fe" xlink:to="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019b2e8d-79a6-7701-8710-dfc82fc1c973" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedBeforeReinsurance_019b2e8d-79a6-743a-a471-66739656310b" xlink:href="fnf-20251231.xsd#fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019b2e8d-79a6-7701-8710-dfc82fc1c973" xlink:to="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedBeforeReinsurance_019b2e8d-79a6-743a-a471-66739656310b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019b2e8d-79a6-7e11-8412-7d9433689b01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019b2e8d-79a6-7701-8710-dfc82fc1c973" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019b2e8d-79a6-7e11-8412-7d9433689b01" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsGrossPremiumIncomeandInterestExpenseDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsGrossPremiumIncomeandInterestExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsGrossPremiumIncomeandInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-9f58-7902-bead-d6be118c0dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-9f58-71f8-aff6-6f85f3a6a3df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-9f58-7902-bead-d6be118c0dbf" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-9f58-71f8-aff6-6f85f3a6a3df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-9f58-7969-9082-60e292d7e76d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-9f58-71f8-aff6-6f85f3a6a3df" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-9f58-7969-9082-60e292d7e76d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7969-9082-60e292d7e76d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-9f58-7969-9082-60e292d7e76d" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7969-9082-60e292d7e76d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7f56-8ab6-1a2616230eb4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-9f58-7969-9082-60e292d7e76d" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7f56-8ab6-1a2616230eb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-9f58-7284-833c-dc169bdb68bf" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7f56-8ab6-1a2616230eb4" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-9f58-7284-833c-dc169bdb68bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-9f58-72a9-a007-385986be51a9" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7f56-8ab6-1a2616230eb4" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-9f58-72a9-a007-385986be51a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PRTMember_019b2e8d-9f58-71ed-bf60-f59b4c585332" xlink:href="fnf-20251231.xsd#fnf_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-9f58-7f56-8ab6-1a2616230eb4" xlink:to="loc_fnf_PRTMember_019b2e8d-9f58-71ed-bf60-f59b4c585332" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome_019b2e8d-9f58-783a-b3eb-e7c740c5b993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-9f58-7902-bead-d6be118c0dbf" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome_019b2e8d-9f58-783a-b3eb-e7c740c5b993" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019b2e8d-9f58-76fe-a65a-db7911388c84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-9f58-7902-bead-d6be118c0dbf" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019b2e8d-9f58-76fe-a65a-db7911388c84" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsWeightedAverageRatesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsWeightedAverageRatesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsWeightedAverageRatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-be1a-7696-87aa-134634e502b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-be1a-782a-bcce-2fd69a9c1e01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-be1a-7696-87aa-134634e502b8" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-be1a-782a-bcce-2fd69a9c1e01" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-be1a-767b-b8bb-b4e96b161c3a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-be1a-782a-bcce-2fd69a9c1e01" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-be1a-767b-b8bb-b4e96b161c3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-767b-b8bb-b4e96b161c3a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-be1a-767b-b8bb-b4e96b161c3a" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-767b-b8bb-b4e96b161c3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-76be-b0ac-7ba3051d0398" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-be1a-767b-b8bb-b4e96b161c3a" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-76be-b0ac-7ba3051d0398" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-be1a-71f8-a275-de2c3f3981bd" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-76be-b0ac-7ba3051d0398" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-be1a-71f8-a275-de2c3f3981bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-be1a-788f-9012-30ffa67c26d0" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-76be-b0ac-7ba3051d0398" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-be1a-788f-9012-30ffa67c26d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PRTMember_019b2e8d-be1a-7c4e-88ce-d12c0cc94a71" xlink:href="fnf-20251231.xsd#fnf_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-be1a-76be-b0ac-7ba3051d0398" xlink:to="loc_fnf_PRTMember_019b2e8d-be1a-7c4e-88ce-d12c0cc94a71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019b2e8d-be1a-7502-bfa0-11ce0c90b87e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-be1a-7696-87aa-134634e502b8" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019b2e8d-be1a-7502-bfa0-11ce0c90b87e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019b2e8d-be1a-7d36-bf09-017896ead42b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-be1a-7696-87aa-134634e502b8" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019b2e8d-be1a-7d36-bf09-017896ead42b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/FuturePolicyBenefitsActualExperienceandExpectedExperienceforMortalityandLapsesDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#FuturePolicyBenefitsActualExperienceandExpectedExperienceforMortalityandLapsesDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/FuturePolicyBenefitsActualExperienceandExpectedExperienceforMortalityandLapsesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-d99f-78db-a433-3b9401251e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-d99f-7ff2-a6ec-bc9f589ee34f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-d99f-78db-a433-3b9401251e2d" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-d99f-7ff2-a6ec-bc9f589ee34f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LongDurationContractsAssumptionsAxis_019b2e8d-d99f-7324-ac9d-92123651a03f" xlink:href="fnf-20251231.xsd#fnf_LongDurationContractsAssumptionsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-d99f-7ff2-a6ec-bc9f589ee34f" xlink:to="loc_fnf_LongDurationContractsAssumptionsAxis_019b2e8d-d99f-7324-ac9d-92123651a03f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LongDurationContractsAssumptionsDomain_019b2e8d-d99f-7324-ac9d-92123651a03f_default" xlink:href="fnf-20251231.xsd#fnf_LongDurationContractsAssumptionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fnf_LongDurationContractsAssumptionsAxis_019b2e8d-d99f-7324-ac9d-92123651a03f" xlink:to="loc_fnf_LongDurationContractsAssumptionsDomain_019b2e8d-d99f-7324-ac9d-92123651a03f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LongDurationContractsAssumptionsDomain_019b2e8d-d99f-7be7-a7e0-2ff89394e7a6" xlink:href="fnf-20251231.xsd#fnf_LongDurationContractsAssumptionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fnf_LongDurationContractsAssumptionsAxis_019b2e8d-d99f-7324-ac9d-92123651a03f" xlink:to="loc_fnf_LongDurationContractsAssumptionsDomain_019b2e8d-d99f-7be7-a7e0-2ff89394e7a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LongDurationContractsAssumptionsActualExperienceMember_019b2e8d-d99f-7800-9d07-72cfab82dd34" xlink:href="fnf-20251231.xsd#fnf_LongDurationContractsAssumptionsActualExperienceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_LongDurationContractsAssumptionsDomain_019b2e8d-d99f-7be7-a7e0-2ff89394e7a6" xlink:to="loc_fnf_LongDurationContractsAssumptionsActualExperienceMember_019b2e8d-d99f-7800-9d07-72cfab82dd34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LongDurationContractsAssumptionsExpectedExperienceMember_019b2e8d-d99f-740d-911b-ab89c4b52cb2" xlink:href="fnf-20251231.xsd#fnf_LongDurationContractsAssumptionsExpectedExperienceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fnf_LongDurationContractsAssumptionsDomain_019b2e8d-d99f-7be7-a7e0-2ff89394e7a6" xlink:to="loc_fnf_LongDurationContractsAssumptionsExpectedExperienceMember_019b2e8d-d99f-740d-911b-ab89c4b52cb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019b2e8d-d99f-7a91-8b2b-330b8463b35d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019b2e8d-d99f-7ff2-a6ec-bc9f589ee34f" xlink:to="loc_srt_ProductOrServiceAxis_019b2e8d-d99f-7a91-8b2b-330b8463b35d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-7a91-8b2b-330b8463b35d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-d99f-7a91-8b2b-330b8463b35d" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-7a91-8b2b-330b8463b35d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-754e-8335-7a124ebba156" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019b2e8d-d99f-7a91-8b2b-330b8463b35d" xlink:to="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-754e-8335-7a124ebba156" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-d99f-7b7d-abbe-4944a47d472e" xlink:href="fnf-20251231.xsd#fnf_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-754e-8335-7a124ebba156" xlink:to="loc_fnf_TraditionalLifeInsuranceMember_019b2e8d-d99f-7b7d-abbe-4944a47d472e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ImmediateAnnuityMember_019b2e8d-d99f-75db-8840-eebb1121103e" xlink:href="fnf-20251231.xsd#fnf_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-754e-8335-7a124ebba156" xlink:to="loc_fnf_ImmediateAnnuityMember_019b2e8d-d99f-75db-8840-eebb1121103e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PensionRiskTransfersMember_019b2e8d-d99f-7739-aaae-f9289bff45cd" xlink:href="fnf-20251231.xsd#fnf_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019b2e8d-d99f-754e-8335-7a124ebba156" xlink:to="loc_fnf_PensionRiskTransfersMember_019b2e8d-d99f-7739-aaae-f9289bff45cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate_019b2e8d-d99f-7be4-9645-63a43b8c79c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-d99f-78db-a433-3b9401251e2d" xlink:to="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate_019b2e8d-d99f-7be4-9645-63a43b8c79c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate_019b2e8d-d99f-7449-85dc-fa1afece1b4b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019b2e8d-d99f-78db-a433-3b9401251e2d" xlink:to="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate_019b2e8d-d99f-7449-85dc-fa1afece1b4b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationBalanceSheetsParentCompanyDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ScheduleIICondensedFinancialInformationBalanceSheetsParentCompanyDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationBalanceSheetsParentCompanyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_fa8b1170-0f4c-4486-8e4e-f5030920019a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedBalanceSheetStatementsCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementTable_b1c5346e-e914-4712-a1aa-31bd678a5a5d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedBalanceSheetStatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_fa8b1170-0f4c-4486-8e4e-f5030920019a" xlink:to="loc_srt_CondensedBalanceSheetStatementTable_b1c5346e-e914-4712-a1aa-31bd678a5a5d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_0da77ab0-0561-4031-86be-73be854fe703" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_b1c5346e-e914-4712-a1aa-31bd678a5a5d" xlink:to="loc_srt_ConsolidatedEntitiesAxis_0da77ab0-0561-4031-86be-73be854fe703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_0da77ab0-0561-4031-86be-73be854fe703_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_0da77ab0-0561-4031-86be-73be854fe703" xlink:to="loc_srt_ConsolidatedEntitiesDomain_0da77ab0-0561-4031-86be-73be854fe703_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_4dcd1eac-c691-4689-a6b1-901f0ec34ec1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_0da77ab0-0561-4031-86be-73be854fe703" xlink:to="loc_srt_ConsolidatedEntitiesDomain_4dcd1eac-c691-4689-a6b1-901f0ec34ec1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_0b2c8287-fe89-401b-82a2-ee0e5e6d752e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_4dcd1eac-c691-4689-a6b1-901f0ec34ec1" xlink:to="loc_srt_ParentCompanyMember_0b2c8287-fe89-401b-82a2-ee0e5e6d752e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c298a-547b-7801-8cd3-b360d98b5a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_b1c5346e-e914-4712-a1aa-31bd678a5a5d" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c298a-547b-7801-8cd3-b360d98b5a7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c298a-547b-7801-8cd3-b360d98b5a7a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c298a-547b-7801-8cd3-b360d98b5a7a" xlink:to="loc_us-gaap_ClassOfStockDomain_019c298a-547b-7801-8cd3-b360d98b5a7a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c298a-547b-7175-a2e3-04eed28095a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c298a-547b-7801-8cd3-b360d98b5a7a" xlink:to="loc_us-gaap_ClassOfStockDomain_019c298a-547b-7175-a2e3-04eed28095a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_019c298a-547b-7748-8579-7c7132a3ea90" xlink:href="fnf-20251231.xsd#fnf_FidelityNationalFinancialGroupCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c298a-547b-7175-a2e3-04eed28095a8" xlink:to="loc_fnf_FidelityNationalFinancialGroupCommonStockMember_019c298a-547b-7748-8579-7c7132a3ea90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_fa8b1170-0f4c-4486-8e4e-f5030920019a" xlink:to="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5108b59a-ad0f-4ad1-a1fc-0638e4ee100e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5108b59a-ad0f-4ad1-a1fc-0638e4ee100e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_b6370704-8e1c-490c-86be-2e404494beae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_us-gaap_ShortTermInvestments_b6370704-8e1c-490c-86be-2e404494beae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_fcf280d4-d85e-4939-b095-b46c6612dee0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_us-gaap_EquityMethodInvestments_fcf280d4-d85e-4939-b095-b46c6612dee0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_f0ba3e58-b1f7-485e-90cf-9fb9c1f1dc1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndNotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_f0ba3e58-b1f7-485e-90cf-9fb9c1f1dc1a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_InvestmentsinSubsidiariesandDuefromSubsidiaries_51393d4a-3f41-4b1e-bc55-7bc455b2c3f9" xlink:href="fnf-20251231.xsd#fnf_InvestmentsinSubsidiariesandDuefromSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_fnf_InvestmentsinSubsidiariesandDuefromSubsidiaries_51393d4a-3f41-4b1e-bc55-7bc455b2c3f9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_e5146760-5315-4441-a1e7-52cf88a27701" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_e5146760-5315-4441-a1e7-52cf88a27701" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_8f785f70-f169-445e-ba85-f6b4a1fb6e43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_90159a9f-0280-47c8-b874-a0f6ec43f319" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_8f785f70-f169-445e-ba85-f6b4a1fb6e43" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_4b1ccd03-3fc5-4b0e-a61b-8857f44acd89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_fa8b1170-0f4c-4486-8e4e-f5030920019a" xlink:to="loc_us-gaap_Assets_4b1ccd03-3fc5-4b0e-a61b-8857f44acd89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_66d0d90a-d4a4-4a9c-a989-ec7d069cd288" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_fa8b1170-0f4c-4486-8e4e-f5030920019a" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_66d0d90a-d4a4-4a9c-a989-ec7d069cd288" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_53859242-b65e-418e-abb6-448965a13eee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_66d0d90a-d4a4-4a9c-a989-ec7d069cd288" xlink:to="loc_us-gaap_LiabilitiesAbstract_53859242-b65e-418e-abb6-448965a13eee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_19591e78-d01d-4624-8ff3-82165365a2e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_53859242-b65e-418e-abb6-448965a13eee" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_19591e78-d01d-4624-8ff3-82165365a2e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_35b412cd-d639-47f8-91b2-b6c1a0a7be52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_53859242-b65e-418e-abb6-448965a13eee" xlink:to="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_35b412cd-d639-47f8-91b2-b6c1a0a7be52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_e47b283d-3b11-4d8d-a22f-ece9dd15ecce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_53859242-b65e-418e-abb6-448965a13eee" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_e47b283d-3b11-4d8d-a22f-ece9dd15ecce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_8048902d-1786-4f35-aa1e-beea92364fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_53859242-b65e-418e-abb6-448965a13eee" xlink:to="loc_us-gaap_LongTermDebt_8048902d-1786-4f35-aa1e-beea92364fdb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_bd003d4a-2e5c-48dc-b860-3a2386cbdd23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_66d0d90a-d4a4-4a9c-a989-ec7d069cd288" xlink:to="loc_us-gaap_Liabilities_bd003d4a-2e5c-48dc-b860-3a2386cbdd23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_66d0d90a-d4a4-4a9c-a989-ec7d069cd288" xlink:to="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_f6611fde-95f3-4c1f-991f-d6a607fafe00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:to="loc_us-gaap_CommonStockValue_f6611fde-95f3-4c1f-991f-d6a607fafe00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_b9286a4e-0363-437c-8b6c-80ce43485511" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:to="loc_us-gaap_PreferredStockValue_b9286a4e-0363-437c-8b6c-80ce43485511" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_1e0500ed-a7bf-4ad0-a861-5cd6e28291fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_1e0500ed-a7bf-4ad0-a861-5cd6e28291fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7acff589-70ef-4ee3-97f1-4326d9a47f45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7acff589-70ef-4ee3-97f1-4326d9a47f45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_59a259cd-9419-4f1b-9f90-0b13fc89fe58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_59a259cd-9419-4f1b-9f90-0b13fc89fe58" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_d2ecbce7-1cdd-4b43-8e9a-e6d574f689e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_d0e24c94-55e9-441a-beb7-8695cd4062ce" xlink:to="loc_us-gaap_TreasuryStockValue_d2ecbce7-1cdd-4b43-8e9a-e6d574f689e3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_882f9c14-e22d-4f2e-9010-0fc1921165fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_66d0d90a-d4a4-4a9c-a989-ec7d069cd288" xlink:to="loc_us-gaap_StockholdersEquity_882f9c14-e22d-4f2e-9010-0fc1921165fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_f791b9a0-bb07-4812-85eb-1cb2d985e65f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_fa8b1170-0f4c-4486-8e4e-f5030920019a" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_f791b9a0-bb07-4812-85eb-1cb2d985e65f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationBalanceSheetsParentCompanyNarrativeDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ScheduleIICondensedFinancialInformationBalanceSheetsParentCompanyNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationBalanceSheetsParentCompanyNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedBalanceSheetStatementsCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedBalanceSheetStatementTable_875a98b2-2c78-473a-804c-63447844683d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedBalanceSheetStatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_srt_CondensedBalanceSheetStatementTable_875a98b2-2c78-473a-804c-63447844683d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_45ad33af-b640-4dec-9d73-7529a8687449" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedBalanceSheetStatementTable_875a98b2-2c78-473a-804c-63447844683d" xlink:to="loc_srt_ConsolidatedEntitiesAxis_45ad33af-b640-4dec-9d73-7529a8687449" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_45ad33af-b640-4dec-9d73-7529a8687449_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_45ad33af-b640-4dec-9d73-7529a8687449" xlink:to="loc_srt_ConsolidatedEntitiesDomain_45ad33af-b640-4dec-9d73-7529a8687449_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_a0ae7fe1-8c5c-40b1-bc88-26217b6fe4d8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_45ad33af-b640-4dec-9d73-7529a8687449" xlink:to="loc_srt_ConsolidatedEntitiesDomain_a0ae7fe1-8c5c-40b1-bc88-26217b6fe4d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_44c7df80-a09d-4d94-bb75-d9f4ac8060a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_a0ae7fe1-8c5c-40b1-bc88-26217b6fe4d8" xlink:to="loc_srt_ParentCompanyMember_44c7df80-a09d-4d94-bb75-d9f4ac8060a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_dc4280fa-4c1a-4b30-a8eb-1d36bb758266" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_dc4280fa-4c1a-4b30-a8eb-1d36bb758266" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_88d64327-e200-4767-bc4e-9a7e14f2aeb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_88d64327-e200-4767-bc4e-9a7e14f2aeb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_2f7a0588-19ca-4ead-a3a8-1e20bc215477" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_2f7a0588-19ca-4ead-a3a8-1e20bc215477" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_503e0b80-995c-4d45-b58a-f72b999613e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_CommonStockSharesIssued_503e0b80-995c-4d45-b58a-f72b999613e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_6ae7a320-31a6-4944-b2f3-02999b668019" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_6ae7a320-31a6-4944-b2f3-02999b668019" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_df65ade2-ef1f-44ac-baef-b7b94c9a091e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_df65ade2-ef1f-44ac-baef-b7b94c9a091e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_b13a02f5-40df-421e-b52c-87cc074a13c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_PreferredStockSharesIssued_b13a02f5-40df-421e-b52c-87cc074a13c8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_f05e1daa-fbbf-44d8-95c3-d87d31471e17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_f05e1daa-fbbf-44d8-95c3-d87d31471e17" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_e4a6da85-cf29-452a-93e4-f4a5f1a661e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedBalanceSheetStatementsCaptionsLineItems_4508fcb2-fbe9-44a3-b30b-69e1025c7939" xlink:to="loc_us-gaap_TreasuryStockCommonShares_e4a6da85-cf29-452a-93e4-f4a5f1a661e5" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationStatementofEarningsParentCompanyDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ScheduleIICondensedFinancialInformationStatementofEarningsParentCompanyDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationStatementofEarningsParentCompanyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedIncomeStatementsCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedIncomeStatementTable_80b3e84e-cae7-42d4-a596-03c5380b7c2e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedIncomeStatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_srt_CondensedIncomeStatementTable_80b3e84e-cae7-42d4-a596-03c5380b7c2e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1e6c554c-a893-4e74-91ea-5585b6b972af" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedIncomeStatementTable_80b3e84e-cae7-42d4-a596-03c5380b7c2e" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1e6c554c-a893-4e74-91ea-5585b6b972af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1e6c554c-a893-4e74-91ea-5585b6b972af_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1e6c554c-a893-4e74-91ea-5585b6b972af" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1e6c554c-a893-4e74-91ea-5585b6b972af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_4c2932dd-e26e-404a-8e3f-53f8a0d7df52" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1e6c554c-a893-4e74-91ea-5585b6b972af" xlink:to="loc_srt_ConsolidatedEntitiesDomain_4c2932dd-e26e-404a-8e3f-53f8a0d7df52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_7957fa23-10ca-4981-b0a9-6dd24fdfcede" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_4c2932dd-e26e-404a-8e3f-53f8a0d7df52" xlink:to="loc_srt_ParentCompanyMember_7957fa23-10ca-4981-b0a9-6dd24fdfcede" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6add9904-118f-4213-a302-125e38eca178" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedIncomeStatementTable_80b3e84e-cae7-42d4-a596-03c5380b7c2e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6add9904-118f-4213-a302-125e38eca178" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6add9904-118f-4213-a302-125e38eca178_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6add9904-118f-4213-a302-125e38eca178" xlink:to="loc_us-gaap_EquityComponentDomain_6add9904-118f-4213-a302-125e38eca178_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_22b4ea89-d103-4ef6-afc5-5b150558d813" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6add9904-118f-4213-a302-125e38eca178" xlink:to="loc_us-gaap_EquityComponentDomain_22b4ea89-d103-4ef6-afc5-5b150558d813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_1737d8a8-200f-41f1-a7f9-557bd17d7095" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_22b4ea89-d103-4ef6-afc5-5b150558d813" xlink:to="loc_us-gaap_RetainedEarningsMember_1737d8a8-200f-41f1-a7f9-557bd17d7095" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_1e94e3df-6f57-40c1-9c19-729f667bdf84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_RevenuesAbstract_1e94e3df-6f57-40c1-9c19-729f667bdf84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_f86f7be0-5d12-4a22-a4d9-4e20b15baf01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e94e3df-6f57-40c1-9c19-729f667bdf84" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_f86f7be0-5d12-4a22-a4d9-4e20b15baf01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_NetInvestmentIncomeAndGainLossOnInvestments_1b53325e-be5f-48c0-995b-958c149076ff" xlink:href="fnf-20251231.xsd#fnf_NetInvestmentIncomeAndGainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e94e3df-6f57-40c1-9c19-729f667bdf84" xlink:to="loc_fnf_NetInvestmentIncomeAndGainLossOnInvestments_1b53325e-be5f-48c0-995b-958c149076ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_67e5270c-4dc5-468b-8fdc-ac5a37d86785" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e94e3df-6f57-40c1-9c19-729f667bdf84" xlink:to="loc_us-gaap_GainLossOnInvestments_67e5270c-4dc5-468b-8fdc-ac5a37d86785" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_0a6ef551-9c68-4b6b-a7e7-a2cf47f212ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_1e94e3df-6f57-40c1-9c19-729f667bdf84" xlink:to="loc_us-gaap_Revenues_0a6ef551-9c68-4b6b-a7e7-a2cf47f212ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_4984734c-14c3-4ab5-990e-658347128180" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_4984734c-14c3-4ab5-990e-658347128180" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_1b10da32-5b68-4adb-981d-499d4e80b9da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_4984734c-14c3-4ab5-990e-658347128180" xlink:to="loc_us-gaap_LaborAndRelatedExpense_1b10da32-5b68-4adb-981d-499d4e80b9da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_1c4dd4c2-2ab8-4e38-93a9-9717b28cc073" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_4984734c-14c3-4ab5-990e-658347128180" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_1c4dd4c2-2ab8-4e38-93a9-9717b28cc073" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_989746d3-61a1-44df-8d76-c3772bace456" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_4984734c-14c3-4ab5-990e-658347128180" xlink:to="loc_us-gaap_InterestExpenseNonoperating_989746d3-61a1-44df-8d76-c3772bace456" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_7a3a4330-5321-4d30-afca-5ad459a0b0d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BenefitsLossesAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_4984734c-14c3-4ab5-990e-658347128180" xlink:to="loc_us-gaap_BenefitsLossesAndExpenses_7a3a4330-5321-4d30-afca-5ad459a0b0d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_f1aae66b-cef8-4e3c-83bf-e807d33a4560" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_f1aae66b-cef8-4e3c-83bf-e807d33a4560" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_45cc36de-54d9-4e3f-a91a-59969f9c1c66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_45cc36de-54d9-4e3f-a91a-59969f9c1c66" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncomeLossFromContinuingOperationsBeforeIncomeLossinSubsidiariesNetofIncomeTax_268298fb-b0f4-4519-be79-0c563a943a60" xlink:href="fnf-20251231.xsd#fnf_IncomeLossFromContinuingOperationsBeforeIncomeLossinSubsidiariesNetofIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_fnf_IncomeLossFromContinuingOperationsBeforeIncomeLossinSubsidiariesNetofIncomeTax_268298fb-b0f4-4519-be79-0c563a943a60" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncomeLossfromSubsidiariesAndDiscontinuedOperationsNetofTax_acb0cde2-06d4-4242-97ac-12b02caef4b6" xlink:href="fnf-20251231.xsd#fnf_IncomeLossfromSubsidiariesAndDiscontinuedOperationsNetofTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_fnf_IncomeLossfromSubsidiariesAndDiscontinuedOperationsNetofTax_acb0cde2-06d4-4242-97ac-12b02caef4b6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_48c581ff-a5aa-4108-82cf-99576102542b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_NetIncomeLoss_48c581ff-a5aa-4108-82cf-99576102542b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_d2b9e6d4-4b5a-4590-888b-2a70c995ac7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_d2b9e6d4-4b5a-4590-888b-2a70c995ac7f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_af470f98-8c0b-4ebc-9da5-6cbfaf48be43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_DividendsCommonStockCash_af470f98-8c0b-4ebc-9da5-6cbfaf48be43" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockStock_8b026550-745f-40be-9b09-934176d60973" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedIncomeStatementsCaptionsLineItems_4e4dd938-0420-405b-8735-29088da32087" xlink:to="loc_us-gaap_DividendsCommonStockStock_8b026550-745f-40be-9b09-934176d60973" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_90ad56c9-e1dd-431c-b536-555785f0d2cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_829b1a0a-6f2c-411f-ad84-bf8ef31db509" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationStatementofCashFlowParentCompanyDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ScheduleIICondensedFinancialInformationStatementofCashFlowParentCompanyDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationStatementofCashFlowParentCompanyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedCashFlowStatementsCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedCashFlowStatementTable_3356f439-0117-465c-95d3-d738c7da5f9a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedCashFlowStatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:to="loc_srt_CondensedCashFlowStatementTable_3356f439-0117-465c-95d3-d738c7da5f9a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_dc022fc2-d4ea-4f15-8ccd-60d7f37dd9f2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedCashFlowStatementTable_3356f439-0117-465c-95d3-d738c7da5f9a" xlink:to="loc_srt_ConsolidatedEntitiesAxis_dc022fc2-d4ea-4f15-8ccd-60d7f37dd9f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_dc022fc2-d4ea-4f15-8ccd-60d7f37dd9f2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_dc022fc2-d4ea-4f15-8ccd-60d7f37dd9f2" xlink:to="loc_srt_ConsolidatedEntitiesDomain_dc022fc2-d4ea-4f15-8ccd-60d7f37dd9f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_ebd90efe-778a-4b33-9abd-04ad3afd20b8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_dc022fc2-d4ea-4f15-8ccd-60d7f37dd9f2" xlink:to="loc_srt_ConsolidatedEntitiesDomain_ebd90efe-778a-4b33-9abd-04ad3afd20b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_783bb0e7-52d1-48c4-b47d-d99d21f6e345" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_ebd90efe-778a-4b33-9abd-04ad3afd20b8" xlink:to="loc_srt_ParentCompanyMember_783bb0e7-52d1-48c4-b47d-d99d21f6e345" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c913c-0d51-7298-a167-c7038b3da946" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedCashFlowStatementTable_3356f439-0117-465c-95d3-d738c7da5f9a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c913c-0d51-7298-a167-c7038b3da946" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c913c-0d51-7298-a167-c7038b3da946_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c913c-0d51-7298-a167-c7038b3da946" xlink:to="loc_us-gaap_ClassOfStockDomain_019c913c-0d51-7298-a167-c7038b3da946_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c913c-0d51-7994-b66a-fe801a70da4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c913c-0d51-7298-a167-c7038b3da946" xlink:to="loc_us-gaap_ClassOfStockDomain_019c913c-0d51-7994-b66a-fe801a70da4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019c913c-51ae-7e4b-8e0f-84d8b12293b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c913c-0d51-7994-b66a-fe801a70da4e" xlink:to="loc_us-gaap_PreferredStockMember_019c913c-51ae-7e4b-8e0f-84d8b12293b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c913c-8194-7565-ab22-af82802c8c12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c913c-0d51-7994-b66a-fe801a70da4e" xlink:to="loc_us-gaap_CommonStockMember_019c913c-8194-7565-ab22-af82802c8c12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_b0f906c9-4de0-48dc-a2b5-a711f4cb2a18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_b0f906c9-4de0-48dc-a2b5-a711f4cb2a18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d422dbe2-1a88-436a-946b-8cc2ef74d64f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_b0f906c9-4de0-48dc-a2b5-a711f4cb2a18" xlink:to="loc_us-gaap_NetIncomeLoss_d422dbe2-1a88-436a-946b-8cc2ef74d64f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_b0f906c9-4de0-48dc-a2b5-a711f4cb2a18" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromSubsidiariesNetOfTax_0e021a96-4909-4ad2-bcd7-1ce52bbb4875" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromSubsidiariesNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:to="loc_us-gaap_IncomeLossFromSubsidiariesNetOfTax_0e021a96-4909-4ad2-bcd7-1ce52bbb4875" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_877a9563-2acd-43e5-8c7f-f7c2028645a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_877a9563-2acd-43e5-8c7f-f7c2028645a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_3d68953b-8d2b-442f-8584-54d6c55d6856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:to="loc_us-gaap_ShareBasedCompensation_3d68953b-8d2b-442f-8584-54d6c55d6856" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_1f27b704-8678-43e1-8c8b-88352ce5a86b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_1f27b704-8678-43e1-8c8b-88352ce5a86b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_ad72208d-fefd-4da2-9f82-4b413072999e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_ad72208d-fefd-4da2-9f82-4b413072999e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_IncreaseDecreaseInAccountsPayableAccruedLiabilitiesDeferredRevenueAndOtherOperatingLiabilities_22f28a21-08ea-4c1b-b823-34b5874dd823" xlink:href="fnf-20251231.xsd#fnf_IncreaseDecreaseInAccountsPayableAccruedLiabilitiesDeferredRevenueAndOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_09e3a650-9ee8-436c-8951-daca9f8e6fc1" xlink:to="loc_fnf_IncreaseDecreaseInAccountsPayableAccruedLiabilitiesDeferredRevenueAndOtherOperatingLiabilities_22f28a21-08ea-4c1b-b823-34b5874dd823" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ca1e657f-f729-44e6-911a-50c0069faea4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_b0f906c9-4de0-48dc-a2b5-a711f4cb2a18" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ca1e657f-f729-44e6-911a-50c0069faea4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromShortTermInvestments_62ee0269-f04d-40ce-ac76-32c5a31b5309" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:to="loc_us-gaap_PaymentsForProceedsFromShortTermInvestments_62ee0269-f04d-40ce-ac76-32c5a31b5309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquitySecuritiesFvNi_019c8912-c60a-737e-90cd-8cbec745653f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireEquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:to="loc_us-gaap_PaymentsToAcquireEquitySecuritiesFvNi_019c8912-c60a-737e-90cd-8cbec745653f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireNotesReceivable_4287b5e7-2ce0-4b66-a157-5f9d056fd666" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:to="loc_us-gaap_PaymentsToAcquireNotesReceivable_4287b5e7-2ce0-4b66-a157-5f9d056fd666" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromCollectionOfNotesReceivable_784a62b5-6041-452c-b9bb-47fb9086d4ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromCollectionOfNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:to="loc_us-gaap_ProceedsFromCollectionOfNotesReceivable_784a62b5-6041-452c-b9bb-47fb9086d4ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_019c9537-3eee-75f1-b8d7-b0bd95bb24cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_019c9537-3eee-75f1-b8d7-b0bd95bb24cb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d1214540-bca9-4699-8314-b12d5fc3a62a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_0d1c1b60-1a5f-41a1-a8e4-44aa8295995c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_d1214540-bca9-4699-8314-b12d5fc3a62a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_66eb1d9f-2cf6-4249-9b9c-8cb22af6251c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_66eb1d9f-2cf6-4249-9b9c-8cb22af6251c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_bfd560fa-01f7-4775-af2a-fa9bbd76cec9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_bfd560fa-01f7-4775-af2a-fa9bbd76cec9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_2800ded4-039d-46b3-9dfb-7ab702daf4dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_2800ded4-039d-46b3-9dfb-7ab702daf4dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_18176a5b-e98f-4428-9c6e-b81c4bbf0593" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_18176a5b-e98f-4428-9c6e-b81c4bbf0593" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_325f6d45-e530-4f3f-b0a5-401547606f01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_325f6d45-e530-4f3f-b0a5-401547606f01" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ProceedsFromDividendsFromSubsidiaries_94e0264f-8613-49a9-98bf-2e6cac290a1f" xlink:href="fnf-20251231.xsd#fnf_ProceedsFromDividendsFromSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_fnf_ProceedsFromDividendsFromSubsidiaries_94e0264f-8613-49a9-98bf-2e6cac290a1f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_ca29c5cd-3f79-4e79-9cff-b58234f2c853" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_264f5dc0-c270-4ced-81ba-23541cf67b61" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_ca29c5cd-3f79-4e79-9cff-b58234f2c853" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_532d3399-59d4-4ace-a785-fc2a5a8408e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_532d3399-59d4-4ace-a785-fc2a5a8408e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b4ec502c-0383-453a-b5a3-b19f1061f503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_f9291265-b49a-4a9a-b064-cf74fa43575b" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_b4ec502c-0383-453a-b5a3-b19f1061f503" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_609db99d-9b02-4061-98c9-4898647f5455" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationNotestoFinancialStatementsParentCompanyDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ScheduleIICondensedFinancialInformationNotestoFinancialStatementsParentCompanyDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ScheduleIICondensedFinancialInformationNotestoFinancialStatementsParentCompanyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_e960ba08-0cd7-4726-a296-3b3693582a70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:to="loc_us-gaap_DebtInstrumentTable_e960ba08-0cd7-4726-a296-3b3693582a70" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_f4f2585e-2b52-4120-970f-d8c923f18bdd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e960ba08-0cd7-4726-a296-3b3693582a70" xlink:to="loc_srt_ConsolidatedEntitiesAxis_f4f2585e-2b52-4120-970f-d8c923f18bdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_f4f2585e-2b52-4120-970f-d8c923f18bdd_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_f4f2585e-2b52-4120-970f-d8c923f18bdd" xlink:to="loc_srt_ConsolidatedEntitiesDomain_f4f2585e-2b52-4120-970f-d8c923f18bdd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_e93cfa09-0b2a-48c8-a6b5-1d2fbc6a2a6b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_f4f2585e-2b52-4120-970f-d8c923f18bdd" xlink:to="loc_srt_ConsolidatedEntitiesDomain_e93cfa09-0b2a-48c8-a6b5-1d2fbc6a2a6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_a417962c-e8d1-44cf-b103-f8dc9c823b33" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_e93cfa09-0b2a-48c8-a6b5-1d2fbc6a2a6b" xlink:to="loc_srt_ParentCompanyMember_a417962c-e8d1-44cf-b103-f8dc9c823b33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_b325ff0e-9d58-41a0-88cb-c0cd48b6eb82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e960ba08-0cd7-4726-a296-3b3693582a70" xlink:to="loc_us-gaap_CreditFacilityAxis_b325ff0e-9d58-41a0-88cb-c0cd48b6eb82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_b325ff0e-9d58-41a0-88cb-c0cd48b6eb82_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_b325ff0e-9d58-41a0-88cb-c0cd48b6eb82" xlink:to="loc_us-gaap_CreditFacilityDomain_b325ff0e-9d58-41a0-88cb-c0cd48b6eb82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6a270dbc-7f07-4580-b314-b94ee4cee9f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_b325ff0e-9d58-41a0-88cb-c0cd48b6eb82" xlink:to="loc_us-gaap_CreditFacilityDomain_6a270dbc-7f07-4580-b314-b94ee4cee9f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_46fec968-8398-44fc-a639-a56513d0d733" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_6a270dbc-7f07-4580-b314-b94ee4cee9f9" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_46fec968-8398-44fc-a639-a56513d0d733" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_38e0cdcd-f4d1-4e65-aca3-2ce8421bdd96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e960ba08-0cd7-4726-a296-3b3693582a70" xlink:to="loc_us-gaap_DebtInstrumentAxis_38e0cdcd-f4d1-4e65-aca3-2ce8421bdd96" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_38e0cdcd-f4d1-4e65-aca3-2ce8421bdd96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_38e0cdcd-f4d1-4e65-aca3-2ce8421bdd96" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_38e0cdcd-f4d1-4e65-aca3-2ce8421bdd96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_38e0cdcd-f4d1-4e65-aca3-2ce8421bdd96" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_FourPointFiveZeroPercentUnsecuredNotesDueAugust2028Member_c2beb191-0882-4a67-aeec-3bb8b7d19e29" xlink:href="fnf-20251231.xsd#fnf_FourPointFiveZeroPercentUnsecuredNotesDueAugust2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:to="loc_fnf_FourPointFiveZeroPercentUnsecuredNotesDueAugust2028Member_c2beb191-0882-4a67-aeec-3bb8b7d19e29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_ThreePointFourZeroPercentUnsecuredNotesDueSeptember2022Member_a769c167-1571-4021-8c10-bd4a74d82cb6" xlink:href="fnf-20251231.xsd#fnf_ThreePointFourZeroPercentUnsecuredNotesDueSeptember2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:to="loc_fnf_ThreePointFourZeroPercentUnsecuredNotesDueSeptember2022Member_a769c167-1571-4021-8c10-bd4a74d82cb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A245SeniorNotesDueMarch2031Member_d1391655-e770-47ec-825c-c18e60227935" xlink:href="fnf-20251231.xsd#fnf_A245SeniorNotesDueMarch2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:to="loc_fnf_A245SeniorNotesDueMarch2031Member_d1391655-e770-47ec-825c-c18e60227935" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_A3.20SeniorNotesDue2051Member_15acdd57-3802-454c-b329-e4b3fdd05b89" xlink:href="fnf-20251231.xsd#fnf_A3.20SeniorNotesDue2051Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:to="loc_fnf_A3.20SeniorNotesDue2051Member_15acdd57-3802-454c-b329-e4b3fdd05b89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_RevolvingCreditFacilityDueApril2022Member_4dbcae48-d80b-4d4c-aec0-87dc0cfff1a6" xlink:href="fnf-20251231.xsd#fnf_RevolvingCreditFacilityDueApril2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_fab8a902-a9d5-4f99-b787-846ca0180e9c" xlink:to="loc_fnf_RevolvingCreditFacilityDueApril2022Member_4dbcae48-d80b-4d4c-aec0-87dc0cfff1a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_493e3157-16c6-4a74-b74b-32649874bb8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_493e3157-16c6-4a74-b74b-32649874bb8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_49036aea-0b82-4a13-ac72-0fe3cd2dae1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:to="loc_us-gaap_LongTermDebt_49036aea-0b82-4a13-ac72-0fe3cd2dae1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_db2e4019-1099-438b-b522-cd86084937be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:to="loc_us-gaap_InterestPaidNet_db2e4019-1099-438b-b522-cd86084937be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_4ce9c0e0-9f29-4657-b98a-c92b2b0ed075" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_4ce9c0e0-9f29-4657-b98a-c92b2b0ed075" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDividendsPaidToParentCompany_b7d781e2-d58f-4e4c-8730-66a2713675a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashDividendsPaidToParentCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_655325a4-b8e7-4238-bf58-ba03f8f2ea82" xlink:to="loc_us-gaap_CashDividendsPaidToParentCompany_b7d781e2-d58f-4e4c-8730-66a2713675a1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fnf.com/role/ScheduleIVFGReinsuranceDetails" xlink:type="simple" xlink:href="fnf-20251231.xsd#ScheduleIVFGReinsuranceDetails"/>
  <link:definitionLink xlink:role="http://www.fnf.com/role/ScheduleIVFGReinsuranceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_65adfa09-aa6d-4fa6-853d-e989e2855dab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_93716b30-b451-4dd9-af7d-e9fdc9bb616e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_65adfa09-aa6d-4fa6-853d-e989e2855dab" xlink:to="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_93716b30-b451-4dd9-af7d-e9fdc9bb616e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_394f7eea-d2cb-4636-8205-c597620975a4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentTable_93716b30-b451-4dd9-af7d-e9fdc9bb616e" xlink:to="loc_srt_ProductOrServiceAxis_394f7eea-d2cb-4636-8205-c597620975a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_394f7eea-d2cb-4636-8205-c597620975a4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_394f7eea-d2cb-4636-8205-c597620975a4" xlink:to="loc_srt_ProductsAndServicesDomain_394f7eea-d2cb-4636-8205-c597620975a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7c269416-66bb-4dff-9da6-cf0043eb5eef" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_394f7eea-d2cb-4636-8205-c597620975a4" xlink:to="loc_srt_ProductsAndServicesDomain_7c269416-66bb-4dff-9da6-cf0043eb5eef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LifeInsurancePremiumsMember_875e3593-d74e-4a6c-ba84-cc2444efcdaf" xlink:href="fnf-20251231.xsd#fnf_LifeInsurancePremiumsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7c269416-66bb-4dff-9da6-cf0043eb5eef" xlink:to="loc_fnf_LifeInsurancePremiumsMember_875e3593-d74e-4a6c-ba84-cc2444efcdaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_LifeContingentPRTPremiumsMember_d622a14a-f799-4392-9b05-9d4f833c58d8" xlink:href="fnf-20251231.xsd#fnf_LifeContingentPRTPremiumsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7c269416-66bb-4dff-9da6-cf0043eb5eef" xlink:to="loc_fnf_LifeContingentPRTPremiumsMember_d622a14a-f799-4392-9b05-9d4f833c58d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsSegmentMember_48f7d99f-39af-43cf-bf3f-921de0621049" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7c269416-66bb-4dff-9da6-cf0043eb5eef" xlink:to="loc_us-gaap_InvestmentsSegmentMember_48f7d99f-39af-43cf-bf3f-921de0621049" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LifeInsuranceInForceNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_65adfa09-aa6d-4fa6-853d-e989e2855dab" xlink:to="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LifeInsuranceInForceGross_e72a1df0-437a-41c2-a72a-d474672f4247" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LifeInsuranceInForceGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:to="loc_srt_LifeInsuranceInForceGross_e72a1df0-437a-41c2-a72a-d474672f4247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LifeInsuranceInForceCeded_5063912e-f2f1-4742-b143-fc9646bd5fa2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LifeInsuranceInForceCeded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:to="loc_srt_LifeInsuranceInForceCeded_5063912e-f2f1-4742-b143-fc9646bd5fa2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LifeInsuranceInForceAssumed_e0149475-be34-4ec6-942c-465652583985" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LifeInsuranceInForceAssumed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:to="loc_srt_LifeInsuranceInForceAssumed_e0149475-be34-4ec6-942c-465652583985" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LifeInsuranceInForceNet_49a90a32-b85f-4943-a6bb-79a7fcdaad75" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LifeInsuranceInForceNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:to="loc_srt_LifeInsuranceInForceNet_49a90a32-b85f-4943-a6bb-79a7fcdaad75" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LifeInsuranceInForcePercentageAssumedToNet_1f54d842-d062-4103-a1de-3a160c5369fd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LifeInsuranceInForcePercentageAssumedToNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LifeInsuranceInForceNetAbstract_aaf28aa4-d004-468a-8ed5-fd4e3d862d2d" xlink:to="loc_srt_LifeInsuranceInForcePercentageAssumedToNet_1f54d842-d062-4103-a1de-3a160c5369fd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems_65adfa09-aa6d-4fa6-853d-e989e2855dab" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectPremiumsEarned_d33f3105-77cb-459f-a0b8-1a2103208541" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DirectPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:to="loc_us-gaap_DirectPremiumsEarned_d33f3105-77cb-459f-a0b8-1a2103208541" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededPremiumsEarned_644365a7-7978-4970-9adc-a2ecac43815e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:to="loc_us-gaap_CededPremiumsEarned_644365a7-7978-4970-9adc-a2ecac43815e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssumedPremiumsEarned_e1c8ce30-b913-4b71-aa4f-d497c3872591" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssumedPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:to="loc_us-gaap_AssumedPremiumsEarned_e1c8ce30-b913-4b71-aa4f-d497c3872591" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_f37d6c59-a0a3-4e70-bc29-83f453c517a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:to="loc_us-gaap_PremiumsEarnedNet_f37d6c59-a0a3-4e70-bc29-83f453c517a1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsPercentageAssumedToNet_15c537db-b9d5-4605-95b1-d0bf7e68b5f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsPercentageAssumedToNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_16e8df1a-d5cb-4a3c-b657-08321947b2ae" xlink:to="loc_us-gaap_PremiumsPercentageAssumedToNet_15c537db-b9d5-4605-95b1-d0bf7e68b5f8" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_fnf_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_f7a7c56e-18d8-466a-b716-2113ae13ef40" xlink:href="fnf-20251231.xsd#fnf_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_fnf_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_f7a7c56e-18d8-466a-b716-2113ae13ef40" xlink:type="arc" order="691"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_PolicyholderFunds" xlink:type="arc" order="31"/>
  </link:definitionLink>
</link:linkbase>
