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From French falsifier, from Late Latin falsificāre, present active infinitive of falsificō (make false, corrupt, counterfeit, falsify), from Latin falsificus, from falsus (false), corresponding to false +‎ -ify.


  • IPA(key): /ˈfɒlsɪfaɪ/
  • (file)


falsify (third-person singular simple present falsifies, present participle falsifying, simple past and past participle falsified)

  1. (transitive) To alter so as to make false; to make incorrect.
    to falsify a record or document
    • 1633, Edmund Spenser, A Vewe of the Present State of Irelande  [], Dublin: [] Sir James Ware; reprinted as A View of the State of Ireland [], Dublin: [] the Society of Stationers, [] Hibernia Press, [] By John Morrison, 1809:
      The Irish bards use to forge and falsify everything as they list, to please or displease any man.
  2. (transitive) To misrepresent.
  3. (transitive) To prove to be false.
  4. (transitive) To counterfeit; to forge.
    to falsify money
  5. (transitive, accounting) To show (an item of charge inserted in an account) to be wrong.
    • 1833, Joseph Story, Commentaries on the Constitution of the United States
      It will allow the account to stand, with liberty to the plaintiff to surcharge and falsify it
    • 1912, Peyton Boyle, The Federal Reporter: Cases Argued and Determined in the Circuit District Courts of the United States
      The chancery rules governing proceedings to surcharge and falsify accounts are applicable only where an account has been stated between the parties, or where something equivalent thereto has been done.
  6. (transitive, obsolete) To baffle or escape.
    • a. 1680, Samuel Butler, Fragments of an intended second part of the foregoing satire
      For disputants (as swordsmen use to fence / With blunted foyles) engage with blunted sense; / And as th' are wont to falsify a blow, / Use nothing else to pass upon a foe []
  7. (transitive, obsolete) To violate; to break by falsehood.
    to falsify one's faith or word

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The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.

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