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English definition of “acoustic”

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adjective [not gradable]  /əˈku·stɪk/ us  
relating to sound or hearing: Scientists have developed a tiny acoustic device to improve hearing aids. An acoustic musical instrument is one that is not made louder by electrical equipment. Acoustic also means designed to control sound so that you can hear only the sounds you want to hear: acoustic tile
(Definition of acoustic from the Cambridge Academic Content Dictionary © Cambridge University Press)
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