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Meaning of “acoustic” in the English Dictionary

"acoustic" in British English

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uk   /əˈkuː.stɪk/  us   /əˈkuː.stɪk/

acousticnoun [C usually plural]

uk   /əˈkuː.stɪk/  us   /əˈkuː.stɪk/
the way in which the structure of a building or room affects the qualities of musical or spoken sound: The concert was recorded in a church that is famous for its acoustics.
adverb uk   /əˈkuː.stɪ.kəl.i/  us   /əˈkuː.stɪ.kəl.i/
(Definition of acoustic from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"acoustic" in American English

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acousticadjective [not gradable]

 us   /əˈku·stɪk/
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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“acoustic” in British English

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