acoustic

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acoustic ˈkuːstɪk/ adjective
also US acoustical ˈkuːstɪkəl/
acoustic
ˈkuːstɪk/
adjective
also US acoustical ˈkuːstɪkəl/
Learner's definition of ACOUSTIC
: of or relating to sound or to the sense of hearing
of a musical instrument : not having its sound changed by electrical devices
: made with or using acoustic instruments

— acoustically

ˈkuːstɪkli/ adverb
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