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English definition of “nullify”

nullify

verb [T]     /ˈnʌl.ɪ.faɪ/
formal to make a legal agreement or decision have no legal force : The state death penalty law was nullified in 1977.Court cases, orders and decisions to cause something to have no value or effect : All my hard work was nullified when I lost my notes .Cancelling and interrupting
(Definition of nullify verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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