Meaning of acoustic

a•cous•tic

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. an acoustic solo; an acoustic group.
1. of, pertaining 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. a remedy for deafness or imperfect hearing.