verb (used with object), fal·si·fied, fal·si·fy·ing.

  1. to make false or incorrect, especially so as to deceive: to falsify income-tax reports.
  2. to alter fraudulently.
  3. to represent falsely: He falsified the history of his family to conceal his humble origins.
  4. to show or prove to be false; disprove: to falsify a theory.

verb (used without object), fal·si·fied, fal·si·fy·ing.

  1. to make false statements.

verb -fies, -fying or -fied (tr)

  1. to make (a report, evidence, accounts, etc) false or inaccurate by alteration, esp in order to deceive
  2. to prove false; disprove

v.mid-15c., “to prove false,” from Middle French falsifier (15c.), from Late Latin falsificare (see falsify). Meaning “to make false” is from c.1500. Earlier verb was simply falsen (c.1200). Related: Falsified; falsifying.

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