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Verb: nullify  'nú-lu,fI
  1. Declare invalid
    "The contract was nullified";
    - invalidate, annul, quash, void, avoid
  2. Show to be invalid
    - invalidate
  3. Make ineffective by counterbalancing the effect of
    "Her optimism nullifies his gloom";
    - neutralize, neutralise [Brit], negate

Derived forms: nullified, nullifies, nullifying

Type of: cancel, contradict, negate, strike down, weaken

Encyclopedia: Nullify