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English definition of “nullify”

nullify

verb [T]     /ˈnʌlɪfaɪ/ formal
LOSE EFFECT to make something lose its effect: Advances in medicine have nullified the disease's effect.Court cases, orders and decisions
LEGAL to say officially that something has no legal power: The judge could nullify the entire trial.Legislation and law-making
(Definition of nullify verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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