Meaning of “anti-noise” in the English Dictionary

british dictionary

"anti-noise" in British English

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anti-noisenoun [ U ]

uk /ˈæn.ti.nɔɪz/ us /ˈæn.t̬i.nɔɪz/

sound that is produced in such a way that it matches exactly and removes the effect of loud and possibly harmful noises, such as those produced by large engines in factories

(Definition of “anti-noise” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)