nullify - definition and synonyms

verb [transitive] 

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/ˈnʌlɪfaɪ/
present tense
I/you/we/theynullify
he/she/itnullifies
present participlenullifying
past tensenullified
past participlenullified

derived word

nullification

 

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/ˌnʌlɪfɪˈkeɪʃ(ə)n/
noun [uncountable]