verb (used with object), nul·li·fied, nul·li·fy·ing.

  1. to render or declare legally void or inoperative: to nullify a contract.
  2. to deprive (something) of value or effectiveness; make futile or of no consequence.

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

  1. to render legally void or of no effect
  2. to render ineffective or useless; cancel out

v.1590s, from Late Latin nullificare “to esteem lightly, despise,” literally “to make nothing,” from Latin nullus “not any” (see null) + root of facere “to make” (see factitious). Related: Nullified; nullifying.

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