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English definition of “acoustic”

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acoustic

adjective uk   /əˈkuː.stɪk/ us  
relating to sound or hearing: The microphone converts acoustic waves to electrical signals for transmission. used to refer to a musical instrument that is not made louder by electrical equipment: an acoustic guitar

acoustic

noun [C usually plural] uk   /əˈkuː.stɪk/ us  
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.
acoustically
adverb uk   /-stɪ.kəl.i/ us  
(Definition of acoustic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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