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nullify

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verb [transitive] nullify pronunciation in American English /ˈnʌləˌfaɪ/ 
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present tense
I/you/we/theynullify
he/she/itnullifies
present participlenullifying
past tensenullified
past participlenullified
  1. 1
    legal to make something lose its legal effect

    The other candidates sought to have the election results nullified.

  2. 2
    to make something lose its value or effect

    The labor agreement was effectively nullified once the company was sold.

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nullification

 nullify pronunciation in American English /ˌnʌləfɪˈkeɪʃ(ə)n/  noun [uncountable]

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