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Synonyms
nul·li·fy (nŭĺə-fī́)

[Latin nūllificāre, to despise, nūllus, none, + -ficāre, -fy.]

transitive verb: -fied, -fy·ing, -fies. 

  1. To make null; invalidate.
  2. To counteract the force or effectiveness of.