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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:d90d2709-05a1-44fa-a8f4-b9bbe7f2134e,g:490dfaa7-9f39-48b2-90ef-87d404689873-->
<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://fico.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOME" xlink:type="simple" xlink:href="fico-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOME"/>
  <link:definitionLink xlink:role="http://fico.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOME" xlink:type="extended" id="i6f970de954b448d592e194515699d3ef_CONDENSEDCONSOLIDATEDSTATEMENTSOFINCOMEANDCOMPREHENSIVEINCOME">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_050d5aa1-4958-4cb9-82b7-d1f7aaa34ae3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_050d5aa1-4958-4cb9-82b7-d1f7aaa34ae3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_41b1c8c6-6b7b-45ca-9f23-8cbc278c37b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:to="loc_us-gaap_CostOfRevenue_41b1c8c6-6b7b-45ca-9f23-8cbc278c37b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_bc29423e-13f8-4a6d-b49e-0b04fcf7fd29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_bc29423e-13f8-4a6d-b49e-0b04fcf7fd29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_abd1d1c2-d537-408b-a482-ca1c5209cc41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_abd1d1c2-d537-408b-a482-ca1c5209cc41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_433dc54e-0e59-4baa-b36a-0839f60cb42f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_433dc54e-0e59-4baa-b36a-0839f60cb42f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_be81fbd8-cbc2-4312-a835-dde7495daae9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_c0799b68-a8f9-4975-ac7c-7ef4f815046b" xlink:to="loc_us-gaap_CostsAndExpenses_be81fbd8-cbc2-4312-a835-dde7495daae9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_3df6b851-f2e5-4e77-990d-4233ba0ed4aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_OperatingIncomeLoss_3df6b851-f2e5-4e77-990d-4233ba0ed4aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_23c6070e-8cc3-4e05-bae6-416df65b642e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_InterestExpense_23c6070e-8cc3-4e05-bae6-416df65b642e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_1d97ea79-c80c-46c2-a1de-870c73bee1e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_1d97ea79-c80c-46c2-a1de-870c73bee1e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2f46e4ee-747e-46e9-939d-4e6c4ccecbda" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2f46e4ee-747e-46e9-939d-4e6c4ccecbda" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b4205bfd-00d6-425c-9bcb-aa9d4b148f33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b4205bfd-00d6-425c-9bcb-aa9d4b148f33" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_b16efc11-3f76-4033-a0bd-f335cb7f2589" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_NetIncomeLoss_b16efc11-3f76-4033-a0bd-f335cb7f2589" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_40c9169c-154e-43c6-9f40-384b0f7d8e18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_40c9169c-154e-43c6-9f40-384b0f7d8e18" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_42f258f1-023f-442a-a356-9b5ef230db29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecreaseAbstract_40c9169c-154e-43c6-9f40-384b0f7d8e18" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_42f258f1-023f-442a-a356-9b5ef230db29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_7e43d28b-6eea-4354-a530-f9c21515a937" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_7e43d28b-6eea-4354-a530-f9c21515a937" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_2405e0f4-63e0-4fca-aab3-0fbf36c0c8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_EarningsPerShareAbstract_2405e0f4-63e0-4fca-aab3-0fbf36c0c8ae" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_28b817a9-2b67-4a85-b50b-6d48f66a896d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_2405e0f4-63e0-4fca-aab3-0fbf36c0c8ae" xlink:to="loc_us-gaap_EarningsPerShareBasic_28b817a9-2b67-4a85-b50b-6d48f66a896d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_2e83410e-ba81-4ca1-ab3b-765fef05b053" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_2405e0f4-63e0-4fca-aab3-0fbf36c0c8ae" xlink:to="loc_us-gaap_EarningsPerShareDiluted_2e83410e-ba81-4ca1-ab3b-765fef05b053" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_6878a9a3-724c-4a50-8801-a8d207f63928" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_6878a9a3-724c-4a50-8801-a8d207f63928" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_fbc4a483-be0d-462d-9eae-19d607994cea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_6878a9a3-724c-4a50-8801-a8d207f63928" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_fbc4a483-be0d-462d-9eae-19d607994cea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_45c67c9f-bc32-4a52-b583-26f3444bf6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract_6878a9a3-724c-4a50-8801-a8d207f63928" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_45c67c9f-bc32-4a52-b583-26f3444bf6bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_GainLossOnProductLineAssetSale_88d34f06-5d20-4870-9e46-75b16f02677b" xlink:href="fico-20230331.xsd#fico_GainLossOnProductLineAssetSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_fico_GainLossOnProductLineAssetSale_88d34f06-5d20-4870-9e46-75b16f02677b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_af9f0232-649b-4357-bd3a-ed2c06eb562b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8ae675da-e911-4a65-ba6d-cc74ce34accb" xlink:to="loc_us-gaap_StatementTable_af9f0232-649b-4357-bd3a-ed2c06eb562b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_f61132d6-2c11-4c30-a67d-61baacb8d825" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_af9f0232-649b-4357-bd3a-ed2c06eb562b" xlink:to="loc_srt_ProductOrServiceAxis_f61132d6-2c11-4c30-a67d-61baacb8d825" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f61132d6-2c11-4c30-a67d-61baacb8d825_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_f61132d6-2c11-4c30-a67d-61baacb8d825" xlink:to="loc_srt_ProductsAndServicesDomain_f61132d6-2c11-4c30-a67d-61baacb8d825_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3b574715-4162-410c-a490-f2e120df30a1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_f61132d6-2c11-4c30-a67d-61baacb8d825" xlink:to="loc_srt_ProductsAndServicesDomain_3b574715-4162-410c-a490-f2e120df30a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_OnPremisesAndSaaSSoftwareMember_55ce619c-0dac-4bd3-9c0f-8c9662c047d5" xlink:href="fico-20230331.xsd#fico_OnPremisesAndSaaSSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3b574715-4162-410c-a490-f2e120df30a1" xlink:to="loc_fico_OnPremisesAndSaaSSoftwareMember_55ce619c-0dac-4bd3-9c0f-8c9662c047d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyServiceMember_9b7067de-ee5d-4064-917b-ddcc788bfe15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3b574715-4162-410c-a490-f2e120df30a1" xlink:to="loc_us-gaap_TechnologyServiceMember_9b7067de-ee5d-4064-917b-ddcc788bfe15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ScoresProductsMember_fe90f2d7-6fdc-41dd-891c-b9a582fbe14f" xlink:href="fico-20230331.xsd#fico_ScoresProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3b574715-4162-410c-a490-f2e120df30a1" xlink:to="loc_fico_ScoresProductsMember_fe90f2d7-6fdc-41dd-891c-b9a582fbe14f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="fico-20230331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://fico.com/role/CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY" xlink:type="extended" id="ieb5a94f56aef4f5f95f4c105c4f96e6f_CONDENSEDCONSOLIDATEDSTATEMENTOFSTOCKHOLDERSEQUITY">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_b3dbd5d7-2121-4be4-bc84-9e056b2af8e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_b3dbd5d7-2121-4be4-bc84-9e056b2af8e2" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_74623937-1ff0-4d2a-8cda-29558ab64b41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_SharesOutstanding_74623937-1ff0-4d2a-8cda-29558ab64b41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7308e926-c289-41fd-b044-166958ed6c4a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_StockholdersEquity_7308e926-c289-41fd-b044-166958ed6c4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_2208b85e-8754-4957-a378-166cc6a27ba7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_2208b85e-8754-4957-a378-166cc6a27ba7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_7c262c68-bd08-4e82-8e1b-6eb67b8847ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_7c262c68-bd08-4e82-8e1b-6eb67b8847ec" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_85070080-7ef3-4651-bd55-1dc7c29ac84a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_85070080-7ef3-4651-bd55-1dc7c29ac84a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_c121dfa6-6ff6-4a83-9561-5ca045da2a8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_c121dfa6-6ff6-4a83-9561-5ca045da2a8f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_d213cb0a-785b-43aa-bd06-c21f0609b385" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_d213cb0a-785b-43aa-bd06-c21f0609b385" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_0162c863-2c68-4464-9458-a9cc173d24ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_NetIncomeLoss_0162c863-2c68-4464-9458-a9cc173d24ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_394c270a-dbad-4f05-9dab-cd2577093213" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_652119f8-adfd-4443-ae14-74e7947c2250" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_394c270a-dbad-4f05-9dab-cd2577093213" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_baf5f015-4922-4435-be03-788db50b8bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_677a5834-8965-4c3f-ba21-f1884943f5e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_304be1d3-e2f3-4c1a-8b16-7eebc232c106" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_b3dbd5d7-2121-4be4-bc84-9e056b2af8e2" xlink:to="loc_us-gaap_StatementTable_304be1d3-e2f3-4c1a-8b16-7eebc232c106" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6b471128-02a7-4a2b-8115-13fb9dd0fc65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_304be1d3-e2f3-4c1a-8b16-7eebc232c106" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6b471128-02a7-4a2b-8115-13fb9dd0fc65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6b471128-02a7-4a2b-8115-13fb9dd0fc65_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6b471128-02a7-4a2b-8115-13fb9dd0fc65" xlink:to="loc_us-gaap_EquityComponentDomain_6b471128-02a7-4a2b-8115-13fb9dd0fc65_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6b471128-02a7-4a2b-8115-13fb9dd0fc65" xlink:to="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_acc437bf-18da-4370-9bcc-e3c80c02db42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:to="loc_us-gaap_CommonStockMember_acc437bf-18da-4370-9bcc-e3c80c02db42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_c972c156-c064-478c-87ac-1e926abce480" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_c972c156-c064-478c-87ac-1e926abce480" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_b613048f-171b-42fe-bc68-e8e2cb81e9f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:to="loc_us-gaap_TreasuryStockMember_b613048f-171b-42fe-bc68-e8e2cb81e9f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_bdc64a99-910f-46f4-a865-00096de6c737" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:to="loc_us-gaap_RetainedEarningsMember_bdc64a99-910f-46f4-a865-00096de6c737" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fcd88a4b-363f-4c3e-a2f4-037d59e372de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_07cb14f9-ffb7-49a2-b832-fd644fec4c93" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_fcd88a4b-363f-4c3e-a2f4-037d59e372de" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/FairValueMeasurementsFinancialAssetsMeasuredatFairValueonRecurringBasisDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#FairValueMeasurementsFinancialAssetsMeasuredatFairValueonRecurringBasisDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/FairValueMeasurementsFinancialAssetsMeasuredatFairValueonRecurringBasisDetail" xlink:type="extended" id="i590bbabfca1640f0b6548cd3269d87ac_FairValueMeasurementsFinancialAssetsMeasuredatFairValueonRecurringBasisDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_820cfe9b-b3ed-450f-a75e-0d2b77139213" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_77661a20-2c65-4cc2-aa1a-aa0c1539cbe1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_820cfe9b-b3ed-450f-a75e-0d2b77139213" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_77661a20-2c65-4cc2-aa1a-aa0c1539cbe1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_7b226428-dbca-4a4a-aff0-de03e88b20c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_77661a20-2c65-4cc2-aa1a-aa0c1539cbe1" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_7b226428-dbca-4a4a-aff0-de03e88b20c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketableSecuritiesNoncurrent_8bdd0ccb-6c13-4a37-b019-54e3aabf7365" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MarketableSecuritiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_77661a20-2c65-4cc2-aa1a-aa0c1539cbe1" xlink:to="loc_us-gaap_MarketableSecuritiesNoncurrent_8bdd0ccb-6c13-4a37-b019-54e3aabf7365" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_41591b43-59f9-4164-a071-a5c142b69902" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_77661a20-2c65-4cc2-aa1a-aa0c1539cbe1" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_41591b43-59f9-4164-a071-a5c142b69902" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_56a2dc87-372d-4016-a42b-4aa95b6417cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_820cfe9b-b3ed-450f-a75e-0d2b77139213" xlink:to="loc_us-gaap_Cash_56a2dc87-372d-4016-a42b-4aa95b6417cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_93088ce0-1733-4e19-99e1-3ddf9a6d071d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_820cfe9b-b3ed-450f-a75e-0d2b77139213" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_93088ce0-1733-4e19-99e1-3ddf9a6d071d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_55ff79f6-107e-4a25-895d-c52f85d760d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_93088ce0-1733-4e19-99e1-3ddf9a6d071d" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_55ff79f6-107e-4a25-895d-c52f85d760d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_55ff79f6-107e-4a25-895d-c52f85d760d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_55ff79f6-107e-4a25-895d-c52f85d760d0" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_55ff79f6-107e-4a25-895d-c52f85d760d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_21699258-cbb0-4a7e-af16-91a62bac9ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_55ff79f6-107e-4a25-895d-c52f85d760d0" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_21699258-cbb0-4a7e-af16-91a62bac9ac9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_7218cb44-dece-44c6-90ad-9b90f4d2c70b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_21699258-cbb0-4a7e-af16-91a62bac9ac9" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_7218cb44-dece-44c6-90ad-9b90f4d2c70b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0a16449b-dd6a-4c27-bff5-2b693df0f942" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_93088ce0-1733-4e19-99e1-3ddf9a6d071d" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0a16449b-dd6a-4c27-bff5-2b693df0f942" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0a16449b-dd6a-4c27-bff5-2b693df0f942_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0a16449b-dd6a-4c27-bff5-2b693df0f942" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0a16449b-dd6a-4c27-bff5-2b693df0f942_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e3a23d34-9fe1-43a1-a397-b138c1f58cbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0a16449b-dd6a-4c27-bff5-2b693df0f942" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e3a23d34-9fe1-43a1-a397-b138c1f58cbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_b04016cf-3c68-4394-be90-2a9c15702bc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e3a23d34-9fe1-43a1-a397-b138c1f58cbe" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_b04016cf-3c68-4394-be90-2a9c15702bc8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#DerivativeFinancialInstrumentsAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetail" xlink:type="extended" id="ibc6a3da69d97454ea8c2c1579b369f08_DerivativeFinancialInstrumentsAdditionalInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_4f6599fd-f634-4166-8da2-d0a78e397f11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_54565fbb-ac39-447a-84b4-14040b09bea5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_4f6599fd-f634-4166-8da2-d0a78e397f11" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_54565fbb-ac39-447a-84b4-14040b09bea5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_2dea6ab9-d3f7-4127-87ec-830c73847119" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_4f6599fd-f634-4166-8da2-d0a78e397f11" xlink:to="loc_us-gaap_DerivativeTable_2dea6ab9-d3f7-4127-87ec-830c73847119" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_22c92e68-8129-4296-bbf3-43f4fd6bf3b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_2dea6ab9-d3f7-4127-87ec-830c73847119" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_22c92e68-8129-4296-bbf3-43f4fd6bf3b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_22c92e68-8129-4296-bbf3-43f4fd6bf3b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_22c92e68-8129-4296-bbf3-43f4fd6bf3b4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_22c92e68-8129-4296-bbf3-43f4fd6bf3b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_63cfc435-dd4e-4246-9724-abb4ba786cd8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_22c92e68-8129-4296-bbf3-43f4fd6bf3b4" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_63cfc435-dd4e-4246-9724-abb4ba786cd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_76f192e5-4436-410f-b4ee-ee5a43c4f65a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_63cfc435-dd4e-4246-9724-abb4ba786cd8" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_76f192e5-4436-410f-b4ee-ee5a43c4f65a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/DerivativeFinancialInstrumentsSummaryofOutstandingForwardForeignCurrencyContractsbyCurrencyDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#DerivativeFinancialInstrumentsSummaryofOutstandingForwardForeignCurrencyContractsbyCurrencyDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/DerivativeFinancialInstrumentsSummaryofOutstandingForwardForeignCurrencyContractsbyCurrencyDetail" xlink:type="extended" id="i773cdf5162e0487f9f1d1872d218b24e_DerivativeFinancialInstrumentsSummaryofOutstandingForwardForeignCurrencyContractsbyCurrencyDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_7516d33f-8bdb-4c29-b900-37fc6f3a190a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNotionalAmount_2da1907c-fe30-4928-9e2d-ff16b3435c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_7516d33f-8bdb-4c29-b900-37fc6f3a190a" xlink:to="loc_us-gaap_DerivativeAssetNotionalAmount_2da1907c-fe30-4928-9e2d-ff16b3435c7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_bb786324-4999-4201-895c-e2d70e674231" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_7516d33f-8bdb-4c29-b900-37fc6f3a190a" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_bb786324-4999-4201-895c-e2d70e674231" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_3aa4e59c-7263-4fe0-a796-9928d12ba7cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_7516d33f-8bdb-4c29-b900-37fc6f3a190a" xlink:to="loc_us-gaap_DerivativeTable_3aa4e59c-7263-4fe0-a796-9928d12ba7cf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesAxis_ae3dea1c-a724-4593-b863-aea3d628dd4a" xlink:href="fico-20230331.xsd#fico_ForeignExchangeContractsToPurchaseCurrenciesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_3aa4e59c-7263-4fe0-a796-9928d12ba7cf" xlink:to="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesAxis_ae3dea1c-a724-4593-b863-aea3d628dd4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ae3dea1c-a724-4593-b863-aea3d628dd4a_default" xlink:href="fico-20230331.xsd#fico_ForeignExchangeContractsToPurchaseCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesAxis_ae3dea1c-a724-4593-b863-aea3d628dd4a" xlink:to="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ae3dea1c-a724-4593-b863-aea3d628dd4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ecf4c438-c0bc-41c6-b7be-822b76b5cb44" xlink:href="fico-20230331.xsd#fico_ForeignExchangeContractsToPurchaseCurrenciesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesAxis_ae3dea1c-a724-4593-b863-aea3d628dd4a" xlink:to="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ecf4c438-c0bc-41c6-b7be-822b76b5cb44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ForeignExchangeContractsToSellEuropeanEuroForUnitedStatesDollarMember_bd6488fa-fed1-435c-87b5-1230685ab7fe" xlink:href="fico-20230331.xsd#fico_ForeignExchangeContractsToSellEuropeanEuroForUnitedStatesDollarMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ecf4c438-c0bc-41c6-b7be-822b76b5cb44" xlink:to="loc_fico_ForeignExchangeContractsToSellEuropeanEuroForUnitedStatesDollarMember_bd6488fa-fed1-435c-87b5-1230685ab7fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ForeignExchangeContractsToPurchaseBritishPoundsWithUnitedStatesDollarsMember_978ad2df-4ae5-4678-a0de-1ebb9fb919ea" xlink:href="fico-20230331.xsd#fico_ForeignExchangeContractsToPurchaseBritishPoundsWithUnitedStatesDollarsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ecf4c438-c0bc-41c6-b7be-822b76b5cb44" xlink:to="loc_fico_ForeignExchangeContractsToPurchaseBritishPoundsWithUnitedStatesDollarsMember_978ad2df-4ae5-4678-a0de-1ebb9fb919ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ForeignExchangeContractsToPurchaseSingaporeDollarsWithUnitedStatesDollarsMemberDomain_4a927100-dca2-4ecc-be91-c37253528ebe" xlink:href="fico-20230331.xsd#fico_ForeignExchangeContractsToPurchaseSingaporeDollarsWithUnitedStatesDollarsMemberDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fico_ForeignExchangeContractsToPurchaseCurrenciesDomain_ecf4c438-c0bc-41c6-b7be-822b76b5cb44" xlink:to="loc_fico_ForeignExchangeContractsToPurchaseSingaporeDollarsWithUnitedStatesDollarsMemberDomain_4a927100-dca2-4ecc-be91-c37253528ebe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_dd0520a3-ed62-49e5-9ff5-3fee600d39af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_3aa4e59c-7263-4fe0-a796-9928d12ba7cf" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_dd0520a3-ed62-49e5-9ff5-3fee600d39af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_dd0520a3-ed62-49e5-9ff5-3fee600d39af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_dd0520a3-ed62-49e5-9ff5-3fee600d39af" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_dd0520a3-ed62-49e5-9ff5-3fee600d39af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_178b453d-d279-41a4-9069-76b39e26b2f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_dd0520a3-ed62-49e5-9ff5-3fee600d39af" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_178b453d-d279-41a4-9069-76b39e26b2f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_74fe57be-2a1c-4d33-ba68-28a6bd24b738" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_178b453d-d279-41a4-9069-76b39e26b2f9" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_74fe57be-2a1c-4d33-ba68-28a6bd24b738" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionAxis_9ad260ee-2355-4cb4-82df-26171dd8ab7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PositionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_3aa4e59c-7263-4fe0-a796-9928d12ba7cf" xlink:to="loc_us-gaap_PositionAxis_9ad260ee-2355-4cb4-82df-26171dd8ab7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_9ad260ee-2355-4cb4-82df-26171dd8ab7b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PositionAxis_9ad260ee-2355-4cb4-82df-26171dd8ab7b" xlink:to="loc_us-gaap_PositionDomain_9ad260ee-2355-4cb4-82df-26171dd8ab7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_e341aa0a-3d88-4f17-9364-b1467e255f3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PositionAxis_9ad260ee-2355-4cb4-82df-26171dd8ab7b" xlink:to="loc_us-gaap_PositionDomain_e341aa0a-3d88-4f17-9364-b1467e255f3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortMember_2ec52686-1d72-4643-9f3a-56e4a9c138d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PositionDomain_e341aa0a-3d88-4f17-9364-b1467e255f3f" xlink:to="loc_us-gaap_ShortMember_2ec52686-1d72-4643-9f3a-56e4a9c138d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_2b7cdbdd-c0ee-463b-a504-f44a2e948180" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_3aa4e59c-7263-4fe0-a796-9928d12ba7cf" xlink:to="loc_us-gaap_HedgingDesignationAxis_2b7cdbdd-c0ee-463b-a504-f44a2e948180" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_2b7cdbdd-c0ee-463b-a504-f44a2e948180_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_2b7cdbdd-c0ee-463b-a504-f44a2e948180" xlink:to="loc_us-gaap_HedgingDesignationDomain_2b7cdbdd-c0ee-463b-a504-f44a2e948180_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_22c0629f-db20-4d76-9fe2-36547ee3d25c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_2b7cdbdd-c0ee-463b-a504-f44a2e948180" xlink:to="loc_us-gaap_HedgingDesignationDomain_22c0629f-db20-4d76-9fe2-36547ee3d25c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_137d7c2d-303d-4266-b388-d5a4b92dc88a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_22c0629f-db20-4d76-9fe2-36547ee3d25c" xlink:to="loc_us-gaap_NondesignatedMember_137d7c2d-303d-4266-b388-d5a4b92dc88a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/DerivativeFinancialInstrumentsGainsLossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementsofIncomeDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#DerivativeFinancialInstrumentsGainsLossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementsofIncomeDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/DerivativeFinancialInstrumentsGainsLossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementsofIncomeDetail" xlink:type="extended" id="iad7f82c605cf4c2897c00dd1a7719035_DerivativeFinancialInstrumentsGainsLossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementsofIncomeDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_e4e9a99b-0c0e-4eb2-917e-8f254cabc4e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_2141dc63-6ee2-463f-abfe-51344c600f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e4e9a99b-0c0e-4eb2-917e-8f254cabc4e1" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_2141dc63-6ee2-463f-abfe-51344c600f9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_e3ac1830-aa98-497d-9e1b-b6d5e2106bdb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_e4e9a99b-0c0e-4eb2-917e-8f254cabc4e1" xlink:to="loc_us-gaap_DerivativeTable_e3ac1830-aa98-497d-9e1b-b6d5e2106bdb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_7a0875e0-d71c-4f62-b955-02bb4e9c1789" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_e3ac1830-aa98-497d-9e1b-b6d5e2106bdb" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_7a0875e0-d71c-4f62-b955-02bb4e9c1789" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_7a0875e0-d71c-4f62-b955-02bb4e9c1789_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7a0875e0-d71c-4f62-b955-02bb4e9c1789" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_7a0875e0-d71c-4f62-b955-02bb4e9c1789_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_980e743a-640f-460d-aad9-87a9cd86db19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_7a0875e0-d71c-4f62-b955-02bb4e9c1789" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_980e743a-640f-460d-aad9-87a9cd86db19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_302f64ab-98e1-4b63-a36d-b0dc67a46098" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_980e743a-640f-460d-aad9-87a9cd86db19" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_302f64ab-98e1-4b63-a36d-b0dc67a46098" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/GoodwillandIntangibleAssetsAmortizationExpenseAssociatedwithIntangibleAssetsDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#GoodwillandIntangibleAssetsAmortizationExpenseAssociatedwithIntangibleAssetsDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/GoodwillandIntangibleAssetsAmortizationExpenseAssociatedwithIntangibleAssetsDetail" xlink:type="extended" id="i0552ec603eee47e8aea20dde368380ae_GoodwillandIntangibleAssetsAmortizationExpenseAssociatedwithIntangibleAssetsDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_77eb1176-90e2-4af7-b273-68f54d8dbf8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_438a5be7-89b8-42cb-884a-e8158d6039cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_77eb1176-90e2-4af7-b273-68f54d8dbf8b" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_438a5be7-89b8-42cb-884a-e8158d6039cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_41771280-b8dd-4c5b-8fc1-d6ec9f152ca9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_77eb1176-90e2-4af7-b273-68f54d8dbf8b" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_41771280-b8dd-4c5b-8fc1-d6ec9f152ca9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_52a10ed1-9a19-4c14-ab15-acd90a06ef33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_41771280-b8dd-4c5b-8fc1-d6ec9f152ca9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_52a10ed1-9a19-4c14-ab15-acd90a06ef33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52a10ed1-9a19-4c14-ab15-acd90a06ef33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_52a10ed1-9a19-4c14-ab15-acd90a06ef33" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_52a10ed1-9a19-4c14-ab15-acd90a06ef33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7400d05-10d6-4fe5-9554-92a95f1e021c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_52a10ed1-9a19-4c14-ab15-acd90a06ef33" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7400d05-10d6-4fe5-9554-92a95f1e021c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_194fefd6-2b0d-4e06-ae0b-130a322917d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyBasedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7400d05-10d6-4fe5-9554-92a95f1e021c" xlink:to="loc_us-gaap_TechnologyBasedIntangibleAssetsMember_194fefd6-2b0d-4e06-ae0b-130a322917d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_82da4ec6-6a7e-424f-b9fa-672bf862ac57" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d7400d05-10d6-4fe5-9554-92a95f1e021c" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_82da4ec6-6a7e-424f-b9fa-672bf862ac57" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/GoodwillandIntangibleAssetsSummaryofChangestoGoodwillDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#GoodwillandIntangibleAssetsSummaryofChangestoGoodwillDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/GoodwillandIntangibleAssetsSummaryofChangestoGoodwillDetail" xlink:type="extended" id="i3ac2ffdcf0e3493799d53c419ab813cd_GoodwillandIntangibleAssetsSummaryofChangestoGoodwillDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_963e101b-0ec5-4f39-a570-7575a4700723" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_0ed9136a-9a98-4847-925e-c8df2774474e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_963e101b-0ec5-4f39-a570-7575a4700723" xlink:to="loc_us-gaap_GoodwillRollForward_0ed9136a-9a98-4847-925e-c8df2774474e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_abe3b057-ad6c-4ee3-9761-2f1ccd248956" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_0ed9136a-9a98-4847-925e-c8df2774474e" xlink:to="loc_us-gaap_Goodwill_abe3b057-ad6c-4ee3-9761-2f1ccd248956" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_54e6470a-6fef-4b0d-8bed-f5866c09ae0f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_0ed9136a-9a98-4847-925e-c8df2774474e" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_54e6470a-6fef-4b0d-8bed-f5866c09ae0f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_51cad24b-0bed-4629-826d-bbd7ac9415a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_ad4588c1-a06a-4444-95d4-61d33b586cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_963e101b-0ec5-4f39-a570-7575a4700723" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_ad4588c1-a06a-4444-95d4-61d33b586cb7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_878bc34e-dfe0-4225-b5b1-10d8d5c38fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_ad4588c1-a06a-4444-95d4-61d33b586cb7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_878bc34e-dfe0-4225-b5b1-10d8d5c38fa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_878bc34e-dfe0-4225-b5b1-10d8d5c38fa3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_878bc34e-dfe0-4225-b5b1-10d8d5c38fa3" xlink:to="loc_us-gaap_SegmentDomain_878bc34e-dfe0-4225-b5b1-10d8d5c38fa3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_074b70c0-ac26-4065-ad95-3458c4058169" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_878bc34e-dfe0-4225-b5b1-10d8d5c38fa3" xlink:to="loc_us-gaap_SegmentDomain_074b70c0-ac26-4065-ad95-3458c4058169" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ScoresMember_58ae79a9-afbc-4af7-9ab3-1c5bb196e7a0" xlink:href="fico-20230331.xsd#fico_ScoresMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_074b70c0-ac26-4065-ad95-3458c4058169" xlink:to="loc_fico_ScoresMember_58ae79a9-afbc-4af7-9ab3-1c5bb196e7a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ApplicationsMember_3b52615d-f4dd-453f-b3a0-364e8f6cacde" xlink:href="fico-20230331.xsd#fico_ApplicationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_074b70c0-ac26-4065-ad95-3458c4058169" xlink:to="loc_fico_ApplicationsMember_3b52615d-f4dd-453f-b3a0-364e8f6cacde" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/RevolvingLineofCreditDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#RevolvingLineofCreditDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/RevolvingLineofCreditDetail" xlink:type="extended" id="i404797ac7ab24e9a80baf78d7917c744_RevolvingLineofCreditDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_4df15cdc-6cc0-4303-a115-e728b463f60e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_4df15cdc-6cc0-4303-a115-e728b463f60e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_9f1e93e0-b1d1-421c-a344-aaf8e7d91526" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_9f1e93e0-b1d1-421c-a344-aaf8e7d91526" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_aba46449-115a-4e79-ae70-0093a9758c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_aba46449-115a-4e79-ae70-0093a9758c7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_LeverageRatiosMaximum_efdcafe3-eecf-4d18-85dc-a422e4728f45" xlink:href="fico-20230331.xsd#fico_LeverageRatiosMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_fico_LeverageRatiosMaximum_efdcafe3-eecf-4d18-85dc-a422e4728f45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_LeverageRatiosStepUpMaximum_136100fb-e4a3-4208-af02-eb6344183ba4" xlink:href="fico-20230331.xsd#fico_LeverageRatiosStepUpMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_fico_LeverageRatiosStepUpMaximum_136100fb-e4a3-4208-af02-eb6344183ba4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_Interestcoverageratio_dbdd4c70-8b82-4751-b035-78ab74d79045" xlink:href="fico-20230331.xsd#fico_Interestcoverageratio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_fico_Interestcoverageratio_dbdd4c70-8b82-4751-b035-78ab74d79045" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_InitialTermLoanToBank_ffcfb262-1ee0-4a03-bcf5-9148f3cf22ce" xlink:href="fico-20230331.xsd#fico_InitialTermLoanToBank"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_fico_InitialTermLoanToBank_ffcfb262-1ee0-4a03-bcf5-9148f3cf22ce" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityPeriodicPayment_5824359f-4206-4763-927a-f689ee9b591d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityPeriodicPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LineOfCreditFacilityPeriodicPayment_5824359f-4206-4763-927a-f689ee9b591d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_b33d4569-7b9d-4e7c-b5bf-81ebf27306dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LineOfCredit_b33d4569-7b9d-4e7c-b5bf-81ebf27306dc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_3c9f950d-f5ce-44db-abc8-00805253b507" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_3c9f950d-f5ce-44db-abc8-00805253b507" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableToBank_deac61ff-a2b5-4db7-bc24-f3035008a124" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayableToBank"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LoansPayableToBank_deac61ff-a2b5-4db7-bc24-f3035008a124" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredLongTermDebt_e53639bc-9904-4972-acf1-fab623f05960" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_UnsecuredLongTermDebt_e53639bc-9904-4972-acf1-fab623f05960" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_95f9ba7d-5fbd-4ea1-97c5-fb39d8eef0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_7dea2c2e-8d4b-41ad-9d6e-06576b09e487" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_95f9ba7d-5fbd-4ea1-97c5-fb39d8eef0b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_f21ac062-148d-443b-99f8-3f6b525038b6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_95f9ba7d-5fbd-4ea1-97c5-fb39d8eef0b1" xlink:to="loc_us-gaap_VariableRateAxis_f21ac062-148d-443b-99f8-3f6b525038b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_f21ac062-148d-443b-99f8-3f6b525038b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_f21ac062-148d-443b-99f8-3f6b525038b6" xlink:to="loc_us-gaap_VariableRateDomain_f21ac062-148d-443b-99f8-3f6b525038b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_e467dd26-f1a1-4405-be79-a0cb338d1aec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_f21ac062-148d-443b-99f8-3f6b525038b6" xlink:to="loc_us-gaap_VariableRateDomain_e467dd26-f1a1-4405-be79-a0cb338d1aec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_FederalFundRateMember_99fc4f3e-ea8f-4026-9814-f0b2a744c2e9" xlink:href="fico-20230331.xsd#fico_FederalFundRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e467dd26-f1a1-4405-be79-a0cb338d1aec" xlink:to="loc_fico_FederalFundRateMember_99fc4f3e-ea8f-4026-9814-f0b2a744c2e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_66c3a4ef-c12e-484f-a753-f0c8041d93cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e467dd26-f1a1-4405-be79-a0cb338d1aec" xlink:to="loc_us-gaap_BaseRateMember_66c3a4ef-c12e-484f-a753-f0c8041d93cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_626b927a-7799-47be-bdbe-c1573bca4ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_e467dd26-f1a1-4405-be79-a0cb338d1aec" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_626b927a-7799-47be-bdbe-c1573bca4ffb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f9326e40-d9a0-4b85-887e-a5002eb8fa12" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_95f9ba7d-5fbd-4ea1-97c5-fb39d8eef0b1" xlink:to="loc_srt_RangeAxis_f9326e40-d9a0-4b85-887e-a5002eb8fa12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f9326e40-d9a0-4b85-887e-a5002eb8fa12_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f9326e40-d9a0-4b85-887e-a5002eb8fa12" xlink:to="loc_srt_RangeMember_f9326e40-d9a0-4b85-887e-a5002eb8fa12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0b5039a3-b15f-4c53-87bb-21023b499792" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f9326e40-d9a0-4b85-887e-a5002eb8fa12" xlink:to="loc_srt_RangeMember_0b5039a3-b15f-4c53-87bb-21023b499792" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9d39e2d4-0619-46f5-8330-f6d8d4f3eab3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0b5039a3-b15f-4c53-87bb-21023b499792" xlink:to="loc_srt_MinimumMember_9d39e2d4-0619-46f5-8330-f6d8d4f3eab3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1db153f6-59a7-4e03-bc26-b17f03479d05" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_0b5039a3-b15f-4c53-87bb-21023b499792" xlink:to="loc_srt_MaximumMember_1db153f6-59a7-4e03-bc26-b17f03479d05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_cc4ffcc9-061c-44c7-b5e9-0b8ac776cbd9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_95f9ba7d-5fbd-4ea1-97c5-fb39d8eef0b1" xlink:to="loc_us-gaap_CreditFacilityAxis_cc4ffcc9-061c-44c7-b5e9-0b8ac776cbd9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_cc4ffcc9-061c-44c7-b5e9-0b8ac776cbd9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_cc4ffcc9-061c-44c7-b5e9-0b8ac776cbd9" xlink:to="loc_us-gaap_CreditFacilityDomain_cc4ffcc9-061c-44c7-b5e9-0b8ac776cbd9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_154d4f44-65bb-4a4c-a5fb-aac8e1a30aa3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_cc4ffcc9-061c-44c7-b5e9-0b8ac776cbd9" xlink:to="loc_us-gaap_CreditFacilityDomain_154d4f44-65bb-4a4c-a5fb-aac8e1a30aa3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_ad9d6e7c-2d02-4262-9bf3-8c959b233daa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_154d4f44-65bb-4a4c-a5fb-aac8e1a30aa3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_ad9d6e7c-2d02-4262-9bf3-8c959b233daa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_TermLoanMember_97c304e1-6d8e-41eb-9c87-a0bac35ba8f3" xlink:href="fico-20230331.xsd#fico_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_154d4f44-65bb-4a4c-a5fb-aac8e1a30aa3" xlink:to="loc_fico_TermLoanMember_97c304e1-6d8e-41eb-9c87-a0bac35ba8f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_c3b2671f-8c42-4829-9f74-35ad5bfe6436" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_95f9ba7d-5fbd-4ea1-97c5-fb39d8eef0b1" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_c3b2671f-8c42-4829-9f74-35ad5bfe6436" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c3b2671f-8c42-4829-9f74-35ad5bfe6436_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_c3b2671f-8c42-4829-9f74-35ad5bfe6436" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c3b2671f-8c42-4829-9f74-35ad5bfe6436_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5b926dc1-9a1e-4565-b0bd-593a21c96801" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_c3b2671f-8c42-4829-9f74-35ad5bfe6436" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5b926dc1-9a1e-4565-b0bd-593a21c96801" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_70e41b70-4603-4999-ab78-dc6f3b42035a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5b926dc1-9a1e-4565-b0bd-593a21c96801" xlink:to="loc_us-gaap_UnsecuredDebtMember_70e41b70-4603-4999-ab78-dc6f3b42035a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/SeniorNotesDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#SeniorNotesDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/SeniorNotesDetail" xlink:type="extended" id="i138d4d09dd3646f1bb405baf64c75f53_SeniorNotesDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_1676b727-ef3a-49b4-982d-196562c325f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_1676b727-ef3a-49b4-982d-196562c325f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_2d4bd0ed-7dc0-4ad7-8462-aeaf2e0999d7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_SeniorNotes_2d4bd0ed-7dc0-4ad7-8462-aeaf2e0999d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_4b32c4f6-5a30-483b-9c0e-eec4fcb795de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_DebtInstrumentFairValue_4b32c4f6-5a30-483b-9c0e-eec4fcb795de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_4fb2b08c-2e77-44bf-aafd-e9cbfc4a4d38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_4fb2b08c-2e77-44bf-aafd-e9cbfc4a4d38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_b6728b75-33cb-42e4-bac1-e31bd2b00e39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_b6728b75-33cb-42e4-bac1-e31bd2b00e39" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6edaa84a-dc06-4e45-bfac-2fff2d37715a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6edaa84a-dc06-4e45-bfac-2fff2d37715a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_33419e11-8288-4e3f-b051-801cec1a58ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_84b1dcd8-eed5-46c5-a28e-2edae92e13b0" xlink:to="loc_us-gaap_DebtInstrumentTable_33419e11-8288-4e3f-b051-801cec1a58ee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1c0ee361-07f4-4849-b9d1-91f0b6e4d0e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_33419e11-8288-4e3f-b051-801cec1a58ee" xlink:to="loc_us-gaap_DebtInstrumentAxis_1c0ee361-07f4-4849-b9d1-91f0b6e4d0e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1c0ee361-07f4-4849-b9d1-91f0b6e4d0e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1c0ee361-07f4-4849-b9d1-91f0b6e4d0e2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1c0ee361-07f4-4849-b9d1-91f0b6e4d0e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_27f86401-30e1-4258-88c5-758a23783054" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1c0ee361-07f4-4849-b9d1-91f0b6e4d0e2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_27f86401-30e1-4258-88c5-758a23783054" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SeniorNotesMayTwentyEighteenMember_7b63b440-18a7-49b7-b2a2-10d75d64128c" xlink:href="fico-20230331.xsd#fico_SeniorNotesMayTwentyEighteenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_27f86401-30e1-4258-88c5-758a23783054" xlink:to="loc_fico_SeniorNotesMayTwentyEighteenMember_7b63b440-18a7-49b7-b2a2-10d75d64128c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SeniorNotes2019And2021Member_abe0c593-322e-4407-aa11-7b3fdfcff760" xlink:href="fico-20230331.xsd#fico_SeniorNotes2019And2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_27f86401-30e1-4258-88c5-758a23783054" xlink:to="loc_fico_SeniorNotes2019And2021Member_abe0c593-322e-4407-aa11-7b3fdfcff760" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SeniorNotesDecemberTwentyOneMember_8f9e0105-e626-4b80-b040-f90c68b329cb" xlink:href="fico-20230331.xsd#fico_SeniorNotesDecemberTwentyOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_27f86401-30e1-4258-88c5-758a23783054" xlink:to="loc_fico_SeniorNotesDecemberTwentyOneMember_8f9e0105-e626-4b80-b040-f90c68b329cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SeniorNotes2019Member_2d2b6e7e-b50c-4e5d-bb9a-f447cb8daa48" xlink:href="fico-20230331.xsd#fico_SeniorNotes2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_27f86401-30e1-4258-88c5-758a23783054" xlink:to="loc_fico_SeniorNotes2019Member_2d2b6e7e-b50c-4e5d-bb9a-f447cb8daa48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0b31d352-50ff-4aaa-a830-12ba6a38bd98" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_33419e11-8288-4e3f-b051-801cec1a58ee" xlink:to="loc_srt_RangeAxis_0b31d352-50ff-4aaa-a830-12ba6a38bd98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0b31d352-50ff-4aaa-a830-12ba6a38bd98_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0b31d352-50ff-4aaa-a830-12ba6a38bd98" xlink:to="loc_srt_RangeMember_0b31d352-50ff-4aaa-a830-12ba6a38bd98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fb301565-774b-4ea1-94fa-13df30d67082" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0b31d352-50ff-4aaa-a830-12ba6a38bd98" xlink:to="loc_srt_RangeMember_fb301565-774b-4ea1-94fa-13df30d67082" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1ccd93f8-13c0-462b-9df6-70f4c09399f5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_fb301565-774b-4ea1-94fa-13df30d67082" xlink:to="loc_srt_MinimumMember_1ccd93f8-13c0-462b-9df6-70f4c09399f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0ca94c4b-5244-40a4-95d9-c87eb4e40c74" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_fb301565-774b-4ea1-94fa-13df30d67082" xlink:to="loc_srt_MaximumMember_0ca94c4b-5244-40a4-95d9-c87eb4e40c74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_d5aa5be6-6e61-4641-9d97-9a24fdbad6f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_33419e11-8288-4e3f-b051-801cec1a58ee" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_d5aa5be6-6e61-4641-9d97-9a24fdbad6f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_d5aa5be6-6e61-4641-9d97-9a24fdbad6f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_d5aa5be6-6e61-4641-9d97-9a24fdbad6f8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_d5aa5be6-6e61-4641-9d97-9a24fdbad6f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_a8b2908b-0df4-40c7-9dcd-245b7a9c2edf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_d5aa5be6-6e61-4641-9d97-9a24fdbad6f8" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_a8b2908b-0df4-40c7-9dcd-245b7a9c2edf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_5c42a220-2b9e-4038-b9f2-2becbc3e170f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_a8b2908b-0df4-40c7-9dcd-245b7a9c2edf" xlink:to="loc_us-gaap_SeniorNotesMember_5c42a220-2b9e-4038-b9f2-2becbc3e170f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/DisaggregationofRevenueDetails" xlink:type="simple" xlink:href="fico-20230331.xsd#DisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://fico.com/role/DisaggregationofRevenueDetails" xlink:type="extended" id="i9f07cf0699744e998d4e424ef856b0ad_DisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_832d0bf2-1d08-4097-8dde-61779040e46d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_34bfcef5-9834-4838-80cc-78b39b775e97" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_832d0bf2-1d08-4097-8dde-61779040e46d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_34bfcef5-9834-4838-80cc-78b39b775e97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_c9db28ca-3d07-4fc0-aa9d-a882fd3e815a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_832d0bf2-1d08-4097-8dde-61779040e46d" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_c9db28ca-3d07-4fc0-aa9d-a882fd3e815a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ConcentrationRiskNumberOfCustomers_29e06458-eab0-4904-b406-6d1d3f5efe0f" xlink:href="fico-20230331.xsd#fico_ConcentrationRiskNumberOfCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_832d0bf2-1d08-4097-8dde-61779040e46d" xlink:to="loc_fico_ConcentrationRiskNumberOfCustomers_29e06458-eab0-4904-b406-6d1d3f5efe0f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_832d0bf2-1d08-4097-8dde-61779040e46d" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_a26adcbc-6ccb-4527-bd3c-ebcb8eb3add7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_a26adcbc-6ccb-4527-bd3c-ebcb8eb3add7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a26adcbc-6ccb-4527-bd3c-ebcb8eb3add7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a26adcbc-6ccb-4527-bd3c-ebcb8eb3add7" xlink:to="loc_us-gaap_SegmentDomain_a26adcbc-6ccb-4527-bd3c-ebcb8eb3add7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_87d7fa4b-4cbd-4dca-b7e1-7bb3d793bd16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_a26adcbc-6ccb-4527-bd3c-ebcb8eb3add7" xlink:to="loc_us-gaap_SegmentDomain_87d7fa4b-4cbd-4dca-b7e1-7bb3d793bd16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ScoresMember_9c44d4e6-c7d3-4fb9-a15c-da52a9dc1f9a" xlink:href="fico-20230331.xsd#fico_ScoresMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_87d7fa4b-4cbd-4dca-b7e1-7bb3d793bd16" xlink:to="loc_fico_ScoresMember_9c44d4e6-c7d3-4fb9-a15c-da52a9dc1f9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SoftwareMember_abd5b47a-bb15-42bd-802a-c95664a73a3a" xlink:href="fico-20230331.xsd#fico_SoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_87d7fa4b-4cbd-4dca-b7e1-7bb3d793bd16" xlink:to="loc_fico_SoftwareMember_abd5b47a-bb15-42bd-802a-c95664a73a3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_c97b403a-3d91-4107-b528-ace0e512faf8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_srt_StatementGeographicalAxis_c97b403a-3d91-4107-b528-ace0e512faf8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_c97b403a-3d91-4107-b528-ace0e512faf8_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_c97b403a-3d91-4107-b528-ace0e512faf8" xlink:to="loc_srt_SegmentGeographicalDomain_c97b403a-3d91-4107-b528-ace0e512faf8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_593ad6b5-9a33-4f11-a28d-7627f5c06e18" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_c97b403a-3d91-4107-b528-ace0e512faf8" xlink:to="loc_srt_SegmentGeographicalDomain_593ad6b5-9a33-4f11-a28d-7627f5c06e18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_fee923f0-a9ad-4f59-a0cf-be152401f963" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_593ad6b5-9a33-4f11-a28d-7627f5c06e18" xlink:to="loc_srt_AmericasMember_fee923f0-a9ad-4f59-a0cf-be152401f963" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_10f498cf-3d0f-4070-b8e4-29672e69e371" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_593ad6b5-9a33-4f11-a28d-7627f5c06e18" xlink:to="loc_us-gaap_EMEAMember_10f498cf-3d0f-4070-b8e4-29672e69e371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_d6f715f4-aed7-454a-986d-11871b6d47a7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_593ad6b5-9a33-4f11-a28d-7627f5c06e18" xlink:to="loc_srt_AsiaPacificMember_d6f715f4-aed7-454a-986d-11871b6d47a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_d4047e05-9f9e-4306-9b7b-83b36ebff375" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_srt_ConsolidationItemsAxis_d4047e05-9f9e-4306-9b7b-83b36ebff375" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_d4047e05-9f9e-4306-9b7b-83b36ebff375_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_d4047e05-9f9e-4306-9b7b-83b36ebff375" xlink:to="loc_srt_ConsolidationItemsDomain_d4047e05-9f9e-4306-9b7b-83b36ebff375_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_2983e228-5c47-4c0b-a9a0-dee6179352e1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_d4047e05-9f9e-4306-9b7b-83b36ebff375" xlink:to="loc_srt_ConsolidationItemsDomain_2983e228-5c47-4c0b-a9a0-dee6179352e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_239914b8-ab3c-4e9c-8b4f-b3f2ed6beee4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2983e228-5c47-4c0b-a9a0-dee6179352e1" xlink:to="loc_us-gaap_OperatingSegmentsMember_239914b8-ab3c-4e9c-8b4f-b3f2ed6beee4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_c3285629-c073-4f7e-915c-5e9cb82a16d6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_srt_ProductOrServiceAxis_c3285629-c073-4f7e-915c-5e9cb82a16d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c3285629-c073-4f7e-915c-5e9cb82a16d6_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_c3285629-c073-4f7e-915c-5e9cb82a16d6" xlink:to="loc_srt_ProductsAndServicesDomain_c3285629-c073-4f7e-915c-5e9cb82a16d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_c3285629-c073-4f7e-915c-5e9cb82a16d6" xlink:to="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_OnPremisesAndSaaSSoftwareMember_7ede5835-9ca3-473b-aa9c-602c9c2a4a24" xlink:href="fico-20230331.xsd#fico_OnPremisesAndSaaSSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_OnPremisesAndSaaSSoftwareMember_7ede5835-9ca3-473b-aa9c-602c9c2a4a24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_OnPremisesProductsMember_66801130-e526-4f4c-8205-337c5e6fd17f" xlink:href="fico-20230331.xsd#fico_OnPremisesProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_OnPremisesProductsMember_66801130-e526-4f4c-8205-337c5e6fd17f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SaaSProductsMember_be7e4a6e-a785-42b9-abaa-d3d9adbcde15" xlink:href="fico-20230331.xsd#fico_SaaSProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_SaaSProductsMember_be7e4a6e-a785-42b9-abaa-d3d9adbcde15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_PlatformSoftwareMember_cb4083f5-18cf-4779-907b-bf0459c962f8" xlink:href="fico-20230331.xsd#fico_PlatformSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_PlatformSoftwareMember_cb4083f5-18cf-4779-907b-bf0459c962f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_NonPlatformSoftwareMember_c25fd6f4-0542-4a7d-88c2-1a638ce59560" xlink:href="fico-20230331.xsd#fico_NonPlatformSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_NonPlatformSoftwareMember_c25fd6f4-0542-4a7d-88c2-1a638ce59560" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_BusinessToBusinessScoresMember_a73f272f-d031-42e8-8df6-2fc7723bf44f" xlink:href="fico-20230331.xsd#fico_BusinessToBusinessScoresMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_BusinessToBusinessScoresMember_a73f272f-d031-42e8-8df6-2fc7723bf44f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_BusinessToConsumerScoresMember_3d117b7e-c819-41f4-a90d-7941378b8f17" xlink:href="fico-20230331.xsd#fico_BusinessToConsumerScoresMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1409b199-6e23-478b-aada-71242a5640e3" xlink:to="loc_fico_BusinessToConsumerScoresMember_3d117b7e-c819-41f4-a90d-7941378b8f17" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_ea10f4ba-b024-4b2b-8e19-239a816a4f19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_ea10f4ba-b024-4b2b-8e19-239a816a4f19" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ea10f4ba-b024-4b2b-8e19-239a816a4f19_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_ea10f4ba-b024-4b2b-8e19-239a816a4f19" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_ea10f4ba-b024-4b2b-8e19-239a816a4f19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_28e9d6ad-5e14-44df-8c6d-2939f2dd3619" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_ea10f4ba-b024-4b2b-8e19-239a816a4f19" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_28e9d6ad-5e14-44df-8c6d-2939f2dd3619" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_a92f84c2-5ea7-42d6-a38d-e59c912ed316" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_28e9d6ad-5e14-44df-8c6d-2939f2dd3619" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_a92f84c2-5ea7-42d6-a38d-e59c912ed316" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_bb684ea3-1b0e-4a1d-83b3-8115f57bb2c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_bb684ea3-1b0e-4a1d-83b3-8115f57bb2c9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_bb684ea3-1b0e-4a1d-83b3-8115f57bb2c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_bb684ea3-1b0e-4a1d-83b3-8115f57bb2c9" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_bb684ea3-1b0e-4a1d-83b3-8115f57bb2c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_4cdaefe9-4743-4883-b459-c78bf8a84e0b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_bb684ea3-1b0e-4a1d-83b3-8115f57bb2c9" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_4cdaefe9-4743-4883-b459-c78bf8a84e0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_bb637c06-497e-4338-8249-27e4b541ecf7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_4cdaefe9-4743-4883-b459-c78bf8a84e0b" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_bb637c06-497e-4338-8249-27e4b541ecf7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_64bafa0f-9487-4588-820a-232711e82e09" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_4cdaefe9-4743-4883-b459-c78bf8a84e0b" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_64bafa0f-9487-4588-820a-232711e82e09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_bf44798d-5fe4-4c7b-b181-ac0c3039a785" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_4cdaefe9-4743-4883-b459-c78bf8a84e0b" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_bf44798d-5fe4-4c7b-b181-ac0c3039a785" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_24a4a6ec-10f7-4bf3-b0e9-e573cdc8cfaf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_24a4a6ec-10f7-4bf3-b0e9-e573cdc8cfaf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_24a4a6ec-10f7-4bf3-b0e9-e573cdc8cfaf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_24a4a6ec-10f7-4bf3-b0e9-e573cdc8cfaf" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_24a4a6ec-10f7-4bf3-b0e9-e573cdc8cfaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_256d88a4-51dd-43d9-822b-135f04d01a64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_24a4a6ec-10f7-4bf3-b0e9-e573cdc8cfaf" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_256d88a4-51dd-43d9-822b-135f04d01a64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_ed96e651-c221-4714-91f6-13319ba7afc2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_256d88a4-51dd-43d9-822b-135f04d01a64" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_ed96e651-c221-4714-91f6-13319ba7afc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_f98e8920-f5ef-4c99-8e3a-6b260551cd03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_256d88a4-51dd-43d9-822b-135f04d01a64" xlink:to="loc_us-gaap_TransferredOverTimeMember_f98e8920-f5ef-4c99-8e3a-6b260551cd03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_e7d1a0b6-f8f7-4b8a-869c-241affd57fbe" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3e5fa6a3-571f-4875-8a09-a4c373caacc6" xlink:to="loc_srt_MajorCustomersAxis_e7d1a0b6-f8f7-4b8a-869c-241affd57fbe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_e7d1a0b6-f8f7-4b8a-869c-241affd57fbe_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_e7d1a0b6-f8f7-4b8a-869c-241affd57fbe" xlink:to="loc_srt_NameOfMajorCustomerDomain_e7d1a0b6-f8f7-4b8a-869c-241affd57fbe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_5583ad52-d7a1-4c17-9b91-17bc09a22276" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_e7d1a0b6-f8f7-4b8a-869c-241affd57fbe" xlink:to="loc_srt_NameOfMajorCustomerDomain_5583ad52-d7a1-4c17-9b91-17bc09a22276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_TransUnionEquifaxAndExperianCustomersMember_928e1c7e-c36b-41e5-9436-ebdfb293b363" xlink:href="fico-20230331.xsd#fico_TransUnionEquifaxAndExperianCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_5583ad52-d7a1-4c17-9b91-17bc09a22276" xlink:to="loc_fico_TransUnionEquifaxAndExperianCustomersMember_928e1c7e-c36b-41e5-9436-ebdfb293b363" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/ContractBalancesPaymentTermsDetails" xlink:type="simple" xlink:href="fico-20230331.xsd#ContractBalancesPaymentTermsDetails"/>
  <link:definitionLink xlink:role="http://fico.com/role/ContractBalancesPaymentTermsDetails" xlink:type="extended" id="i38065d8285e245aabec53dc21efbac51_ContractBalancesPaymentTermsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_fico_ContractWithCustomerPaymentTermLineItems_a5d9a173-d0bf-4424-9bf7-6b35f25c7509" xlink:href="fico-20230331.xsd#fico_ContractWithCustomerPaymentTermLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ContractWithCustomerPaymentTerm_fe205aa8-7d0c-4fa3-bb72-2df8ff8f7781" xlink:href="fico-20230331.xsd#fico_ContractWithCustomerPaymentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fico_ContractWithCustomerPaymentTermLineItems_a5d9a173-d0bf-4424-9bf7-6b35f25c7509" xlink:to="loc_fico_ContractWithCustomerPaymentTerm_fe205aa8-7d0c-4fa3-bb72-2df8ff8f7781" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenueArrangementByTypeTable_43c0eb8c-65f0-411b-8827-5ce37406f6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredRevenueArrangementByTypeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_fico_ContractWithCustomerPaymentTermLineItems_a5d9a173-d0bf-4424-9bf7-6b35f25c7509" xlink:to="loc_us-gaap_DeferredRevenueArrangementByTypeTable_43c0eb8c-65f0-411b-8827-5ce37406f6f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7541ba94-7645-4db8-b5e0-095affbc97ed" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DeferredRevenueArrangementByTypeTable_43c0eb8c-65f0-411b-8827-5ce37406f6f5" xlink:to="loc_srt_RangeAxis_7541ba94-7645-4db8-b5e0-095affbc97ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7541ba94-7645-4db8-b5e0-095affbc97ed_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7541ba94-7645-4db8-b5e0-095affbc97ed" xlink:to="loc_srt_RangeMember_7541ba94-7645-4db8-b5e0-095affbc97ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aba37ef3-518c-4249-b95d-e057a5a2ec9b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7541ba94-7645-4db8-b5e0-095affbc97ed" xlink:to="loc_srt_RangeMember_aba37ef3-518c-4249-b95d-e057a5a2ec9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_7096192d-f95f-4fa5-9dc7-5736df48f54a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aba37ef3-518c-4249-b95d-e057a5a2ec9b" xlink:to="loc_srt_MinimumMember_7096192d-f95f-4fa5-9dc7-5736df48f54a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_096231ee-113c-4940-b409-42c9992166bc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aba37ef3-518c-4249-b95d-e057a5a2ec9b" xlink:to="loc_srt_MaximumMember_096231ee-113c-4940-b409-42c9992166bc" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/PerformanceObligationDetails" xlink:type="simple" xlink:href="fico-20230331.xsd#PerformanceObligationDetails"/>
  <link:definitionLink xlink:role="http://fico.com/role/PerformanceObligationDetails" xlink:type="extended" id="i05e5593672cb40e891c33bcd9d540a48_PerformanceObligationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_af6ce06b-2008-4424-96e1-5db97b009e52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_af6ce06b-2008-4424-96e1-5db97b009e52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_008a5fb3-a710-4962-99f8-9a62b2899a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_008a5fb3-a710-4962-99f8-9a62b2899a9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_16b2670a-61cf-4bc2-a73c-b930a8bda230" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_16b2670a-61cf-4bc2-a73c-b930a8bda230" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_fa9dcc41-c3ac-4cee-82ed-e4b8e05c7fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_fa9dcc41-c3ac-4cee-82ed-e4b8e05c7fb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_484f0dd3-230b-4fca-913b-52eb3b716fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_fa9dcc41-c3ac-4cee-82ed-e4b8e05c7fb6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_484f0dd3-230b-4fca-913b-52eb3b716fa9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/PerformanceObligationDetails_1" xlink:type="simple" xlink:href="fico-20230331.xsd#PerformanceObligationDetails_1"/>
  <link:definitionLink xlink:role="http://fico.com/role/PerformanceObligationDetails_1" xlink:type="extended" id="i559da06d49904dcba6aefb312ab75c20_PerformanceObligationDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_af6ce06b-2008-4424-96e1-5db97b009e52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_af6ce06b-2008-4424-96e1-5db97b009e52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_008a5fb3-a710-4962-99f8-9a62b2899a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_008a5fb3-a710-4962-99f8-9a62b2899a9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_16b2670a-61cf-4bc2-a73c-b930a8bda230" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_16b2670a-61cf-4bc2-a73c-b930a8bda230" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_fa9dcc41-c3ac-4cee-82ed-e4b8e05c7fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cd5b8b95-8e90-4758-aaab-9472d43a3d04" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_fa9dcc41-c3ac-4cee-82ed-e4b8e05c7fb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fico.com/role/SegmentInformationSummaryofSegmentInformationDetail" xlink:type="simple" xlink:href="fico-20230331.xsd#SegmentInformationSummaryofSegmentInformationDetail"/>
  <link:definitionLink xlink:role="http://fico.com/role/SegmentInformationSummaryofSegmentInformationDetail" xlink:type="extended" id="i4772b286c1fb4276b514d9155dfd84a2_SegmentInformationSummaryofSegmentInformationDetail">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationRevenueAbstract_af1da60d-c781-4232-a255-42b66c8a395a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_SegmentReportingInformationRevenueAbstract_af1da60d-c781-4232-a255-42b66c8a395a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5fb38421-9d61-499e-91b2-854cbccae143" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationRevenueAbstract_af1da60d-c781-4232-a255-42b66c8a395a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_5fb38421-9d61-499e-91b2-854cbccae143" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_4ca5d38b-09bd-47c0-8ce6-c721ca27d35c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_CostsAndExpenses_4ca5d38b-09bd-47c0-8ce6-c721ca27d35c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_71deebae-6a45-42e2-b17e-80750da68a44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_OperatingIncomeLoss_71deebae-6a45-42e2-b17e-80750da68a44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_94239b36-0bd1-4a52-85c9-5ba1257894fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_ShareBasedCompensation_94239b36-0bd1-4a52-85c9-5ba1257894fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_80d26214-7b6e-42eb-b147-f6d5988cd865" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_80d26214-7b6e-42eb-b147-f6d5988cd865" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_b815fd25-f139-4a9d-9116-032f5c998ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_InterestExpense_b815fd25-f139-4a9d-9116-032f5c998ed6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_ef20da1a-fd4e-417d-b3f5-080d8295393b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_ef20da1a-fd4e-417d-b3f5-080d8295393b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_1a88adb2-183e-42ae-8f73-a94dae670827" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_1a88adb2-183e-42ae-8f73-a94dae670827" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_6ff3ee26-fbef-4920-9f18-6de2b9c2879c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_Depreciation_6ff3ee26-fbef-4920-9f18-6de2b9c2879c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_1bf7a211-ddb7-4fbc-9806-b87cb8f84250" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_1bf7a211-ddb7-4fbc-9806-b87cb8f84250" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a185ca73-77f7-41da-888e-a56c320119dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_f4ace4e9-6f31-4706-a899-7d19159e65ee" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a185ca73-77f7-41da-888e-a56c320119dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_4ce03a92-f94a-4490-b808-5cba1cd55b79" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a185ca73-77f7-41da-888e-a56c320119dc" xlink:to="loc_srt_ProductOrServiceAxis_4ce03a92-f94a-4490-b808-5cba1cd55b79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_4ce03a92-f94a-4490-b808-5cba1cd55b79_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_4ce03a92-f94a-4490-b808-5cba1cd55b79" xlink:to="loc_srt_ProductsAndServicesDomain_4ce03a92-f94a-4490-b808-5cba1cd55b79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3cb0e6e2-eae2-4231-8adc-3db7b5f57017" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_4ce03a92-f94a-4490-b808-5cba1cd55b79" xlink:to="loc_srt_ProductsAndServicesDomain_3cb0e6e2-eae2-4231-8adc-3db7b5f57017" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyServiceMember_22d0e7ee-67b9-4d5d-9fe5-4b1567e88e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3cb0e6e2-eae2-4231-8adc-3db7b5f57017" xlink:to="loc_us-gaap_TechnologyServiceMember_22d0e7ee-67b9-4d5d-9fe5-4b1567e88e6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_OnPremisesAndSaaSSoftwareMember_ada2b5c2-0bc2-41d4-bef1-ebe0452c0d89" xlink:href="fico-20230331.xsd#fico_OnPremisesAndSaaSSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3cb0e6e2-eae2-4231-8adc-3db7b5f57017" xlink:to="loc_fico_OnPremisesAndSaaSSoftwareMember_ada2b5c2-0bc2-41d4-bef1-ebe0452c0d89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ScoresProductsMember_f9b8dc5a-9e8d-495d-869d-d53832a9344a" xlink:href="fico-20230331.xsd#fico_ScoresProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3cb0e6e2-eae2-4231-8adc-3db7b5f57017" xlink:to="loc_fico_ScoresProductsMember_f9b8dc5a-9e8d-495d-869d-d53832a9344a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_cca1fed9-efab-419e-b6ba-8cdc5412e911" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a185ca73-77f7-41da-888e-a56c320119dc" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_cca1fed9-efab-419e-b6ba-8cdc5412e911" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cca1fed9-efab-419e-b6ba-8cdc5412e911_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_cca1fed9-efab-419e-b6ba-8cdc5412e911" xlink:to="loc_us-gaap_SegmentDomain_cca1fed9-efab-419e-b6ba-8cdc5412e911_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ffe1b91d-68bd-4305-a8c9-08ea6045e52f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_cca1fed9-efab-419e-b6ba-8cdc5412e911" xlink:to="loc_us-gaap_SegmentDomain_ffe1b91d-68bd-4305-a8c9-08ea6045e52f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_ScoresMember_867a6dde-3711-447d-807a-e4ad8bd06770" xlink:href="fico-20230331.xsd#fico_ScoresMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ffe1b91d-68bd-4305-a8c9-08ea6045e52f" xlink:to="loc_fico_ScoresMember_867a6dde-3711-447d-807a-e4ad8bd06770" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fico_SoftwareMember_42598399-9272-46db-bb5c-bbdfff53a2d6" xlink:href="fico-20230331.xsd#fico_SoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ffe1b91d-68bd-4305-a8c9-08ea6045e52f" xlink:to="loc_fico_SoftwareMember_42598399-9272-46db-bb5c-bbdfff53a2d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_a36167c3-c911-49d3-b1cc-45117e669a67" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_a185ca73-77f7-41da-888e-a56c320119dc" xlink:to="loc_srt_ConsolidationItemsAxis_a36167c3-c911-49d3-b1cc-45117e669a67" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a36167c3-c911-49d3-b1cc-45117e669a67_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_a36167c3-c911-49d3-b1cc-45117e669a67" xlink:to="loc_srt_ConsolidationItemsDomain_a36167c3-c911-49d3-b1cc-45117e669a67_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ce51a474-6512-418c-812b-b62a1c72b4c3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_a36167c3-c911-49d3-b1cc-45117e669a67" xlink:to="loc_srt_ConsolidationItemsDomain_ce51a474-6512-418c-812b-b62a1c72b4c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_dc4ae127-961d-4947-8624-5e43f7744e73" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_ce51a474-6512-418c-812b-b62a1c72b4c3" xlink:to="loc_us-gaap_OperatingSegmentsMember_dc4ae127-961d-4947-8624-5e43f7744e73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_1f4ccd54-6f41-4c64-aba1-737136ddd8da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_ce51a474-6512-418c-812b-b62a1c72b4c3" xlink:to="loc_us-gaap_CorporateNonSegmentMember_1f4ccd54-6f41-4c64-aba1-737136ddd8da" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
