adjective Also a·cous·ti·cal.
- pertaining to the sense or organs of hearing, to sound, or to the science of sound.
- (of a building material) designed for controlling sound.
- of, relating to, or being a musical instrument whose sound is not electrically enhanced or modified.
- arranged for or made up of such instruments: an acoustic solo; an acoustic group.
- Obsolete. a remedy for deafness or imperfect hearing.
- of or related to sound, the sense of hearing, or acoustics
- designed to respond to, absorb, or control soundan acoustic tile
- (of a musical instrument or recording) without electronic amplificationan acoustic bass; an acoustic guitar
c.1600, from French acoustique, from Greek akoustikos “pertaining to hearing,” from akoustos “heard, audible,” verbal adjective from akouein “to hear,” probably from copulative prefix a- + koein “to mark, perceive, hear,” from PIE *kous- “to hear,” perhaps from root *(s)keu- “to notice, observe” (see caveat). Acoustic guitar (as opposed to electric) attested by 1958. Related: Acoustical; acoustically.
- Of or relating to sound, the sense of hearing, or the perception of sound.