adjective Also a·cous·ti·cal.

  1. pertaining to the sense or organs of hearing, to sound, or to the science of sound.
  2. (of a building material) designed for controlling sound.
  3. Music.
    1. of, relating to, or being a musical instrument whose sound is not electrically enhanced or modified.
    2. arranged for or made up of such instruments: an acoustic solo; an acoustic group.


  1. Obsolete. a remedy for deafness or imperfect hearing.


  1. of or related to sound, the sense of hearing, or acoustics
  2. designed to respond to, absorb, or control soundan acoustic tile
  3. (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.


  1. Of or relating to sound, the sense of hearing, or the perception of sound.

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