Definition of “nullify” - English Dictionary

“nullify” in British English

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nullifyverb [ T ]

uk /ˈnʌl.ɪ.faɪ/ us /ˈnʌl.ə.faɪ/

(Definition of “nullify” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“nullify” in American English

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nullifyverb [ T ]

us /ˈnʌl·əˌfɑɪ/

to cause an agreement or result to be no longer effective or consider it as not existing:

The referee nullified the goal.

(Definition of “nullify” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“nullify” in Business English

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nullifyverb [ T ]

uk /ˈnʌlɪfaɪ/ us

LAW to make a legal agreement or decision no longer have any legal force:

to cause something to have no value or effect:

A suit has been filed against the directors, charging them with conspiring to nullify a shareholder vote.
The US stated that any reductions in greenhouse gases by the West must not be nullified by increased emissions from developing nations.
nullification
noun [ U ]

(Definition of “nullify” from the Cambridge Business English Dictionary © Cambridge University Press)