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English definition of “nullify”

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nullify

verb [T] uk   /ˈnʌl.ɪ.faɪ/ us  
formal to make a legal agreement or decision have no legal force: The state death penalty law was nullified in 1977. to cause something to have no value or effect: All my hard work was nullified when I lost my notes.
(Definition of nullify from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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