Definition of negate

verb (v)

• be in contradiction with (verb.stative)

  Synonym: belie, contradict
  

  source: wordnet30
• deny the truth of (verb.communication)

  Synonym: contradict, contravene
  

  source: wordnet30
• prove negative; show to be false (verb.cognition)

  Synonym: contradict
  Antonym: affirm, confirm, corroborate, substantiate, support, sustain
  

  source: wordnet30
• make ineffective by counterbalancing the effect of (verb.change)

  Synonym: neutralise, neutralize, nullify
  

  Example:
  This action will negate the effect of my efforts.
  

  source: wordnet30

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