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pertaining to the sense or organs of hearing, to sound, or to the science of sound.
(of a building material) designed for controlling sound.
Music.

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.
Contemporary Examples

There are songs that are straight-up pop records, songs that have a lot of depth, some dance, some acoustic.
Backstreet’s Back! The Backstreet Boys on 20 Years, New Album, BSB Cruise, and More Marlow Stern June 27, 2013

Darren and him were talking and Bruce had an acoustic guitar and picked it up and played the song for Darren.
Rourke’s Resurrection Tom Tapp October 7, 2008

George would take out his lyric book and acoustic guitar and play us the song we would be working on that day.
When Gary Wright Met George Harrison: Dream Weaver, John and Yoko, and More Gary Wright September 28, 2014

The whalers fight back, with devices such as water cannon and acoustic devices.
The Whale Wars Season Premiere Andy Dehnart June 1, 2011

Microwave “pain rays” and acoustic crowd dispersal weapons already exist.
Special Ops’ Weapons Wish List Michael Peck April 8, 2014

Historical Examples

The acoustic tubes seemed to swell out with the gallop of words.
The Four Horsemen of the Apocalypse Vicente Blasco Ibanez

And how comes it that the disturbance always takes an acoustic form?
Legends August Strindberg

It is the most acoustic building possible, as any one may prove by singing in rotation the notes of a chord.
The Cathedral Builders Leader Scott

This theatre it may be noted is one of the best for its acoustic properties in London.
Michael Faraday Walter Jerrold

In this way the second musical box seems to play and the acoustic effect is perfect.
Hours with the Ghosts or, Nineteenth Century Witchcraft Henry Ridgely Evans

adjective
of or related to sound, the sense of hearing, or acoustics
designed to respond to, absorb, or control sound: an acoustic tile
(of a musical instrument or recording) without electronic amplification: an acoustic bass, an acoustic guitar
adj.

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.

acoustic a·cous·tic (ə-kōō’stĭk) or a·cous·ti·cal (-stĭ-kəl)
adj.
Of or relating to sound, the sense of hearing, or the perception of sound.