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Definition of 'nullify'

Verb

  1. declare invalid; "The contract was annulled"; "void a plea"
       Synonyms: invalidate annul quash void avoid
       Antonyms: validate formalize formalise
  2. show to be invalid
       Synonyms: invalidate
       Antonyms: validate
  3. make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
       Synonyms: neutralize neutralise negate


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