adj. also a·cous·ti·cal (-stĭ-kəl) 1. Of or relating to sound, the sense of hearing, or the science of sound. 2. a. Designed to carry sound or to aid in hearing. b. Designed to absorb or control sound: acoustic tile. 3. Music a. Of or being an instrument that does not produce or enhance sound electronically: an acoustic guitar; an acoustic bass. b. Being a performance that features such instruments: opened the show with an acoustic set. n. Music An acoustic instrument. [Greek akoustikos, pertaining to hearing, from akouein, to hear; see kous- in the Appendix of Indo-European roots.] a·cousti·cal·ly adv. |
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