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Definition of acoustic adjective from the Oxford Advanced Learner's Dictionary

acoustic

adjective
 
/əˈkuːstɪk/
 
/əˈkuːstɪk/
(North American English also acoustical
 
/əˈkuːstɪkl/
 
/əˈkuːstɪkl/
)
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  1. related to sound or to the sense of hearing
  2. [usually before noun] (of a musical instrument or performance) designed to make natural sound, not sound amplified (= made louder) by electrical equipmentTopics Musicc1
  3. Word Originmid 17th cent.: from Greek akoustikos, from akouein ‘hear’.
See acoustic in the Oxford Advanced American Dictionary

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