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<!--Generated by XBRL Converter - 8:24AM 16/4/2012 PDT-->
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">000 - Document - Document And Entity Information</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">003 - Statement - Statements of Operations</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">004 - Statement - Statements of Stockholders' (Deficit) Equity</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">005 - Statement - Statements of Cash Flows</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">006 - Disclosure - Note A - The Company and Summary of Significant Accounting Policies</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">008 - Disclosure - Note C - Fair Values of Financial Instruments</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">009 - Disclosure - Note D - Concentration of Risk</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">010 - Disclosure - Note E - Note Receivable</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType id="NoteFPrepaidExpensesAndOther" roleURI="http://www.bio-key.com/20111231/role/NoteFPrepaidExpensesAndOther">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">011 - Disclosure - Note F - Prepaid Expenses and Other</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType id="NoteGEquipmentAndLeaseholdImprovements" roleURI="http://www.bio-key.com/20111231/role/NoteGEquipmentAndLeaseholdImprovements">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">012 - Disclosure - Note G - Equipment and Leasehold Improvements</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType id="NoteHIntangibleAssets" roleURI="http://www.bio-key.com/20111231/role/NoteHIntangibleAssets">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">013 - Disclosure - Note H - Intangible Assets</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType id="NoteIAccruedLiabilities" roleURI="http://www.bio-key.com/20111231/role/NoteIAccruedLiabilities">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">014 - Disclosure - Note I - Accrued Liabilities</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType id="NoteJRelatedParty" roleURI="http://www.bio-key.com/20111231/role/NoteJRelatedParty">
        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">015 - Disclosure - Note J - Related Party</link:definition>
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        <link:usedOn>link:definitionLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">016 - Disclosure - Note K - Deferred Revenue</link:definition>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">017 - Disclosure - Note L - Notes Payable</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">019 - Disclosure - Note N - Commitments</link:definition>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">020 - Disclosure - Note O - Equity</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">021 - Disclosure - Note P - Stock Options</link:definition>
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        <link:definition xmlns="http://www.xbrl.org/2003/linkbase">025 - Disclosure - Note T - Earnings Per Share (EPS)</link:definition>
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  <xsd:element abstract="true" id="bkyi_NotesToFinancialStatements" name="NotesToFinancialStatements" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element id="bkyi_ConversionOfPreferredStockDividendsInArrearsIntoSecuredNotes" name="ConversionOfPreferredStockDividendsInArrearsIntoSecuredNotes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
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</xsd:schema>
