acoustic

Acoustic is defined as the sense of hearing.

(adjective)

An example of the word acoustic is to refer to your ability to hear sound.

The definition of acoustic is music that is played without the use of electronic amplification equipment.

(adjective)

An example of the word acoustic is a song in which only a flute is used.

See acoustic in Webster's New World College Dictionary

adjective

having to do with hearing or with sound as it is heard
of acoustics
1. designating a musical instrument, usually a string instrument, whose tones are not electronically amplified
2. employing such an instrument or instruments

Origin: Fr acoustique < Gr akoustikos, of or for hearing < akouein, to hear < a- (< ?) + IE base *keu-, to heed, hear

See acoustic in American Heritage Dictionary 4

adjective also a·cous·ti·cal (-stĭ-kəl)

Of or relating to sound, the sense of hearing, or the science of sound.
a. Designed to carry sound or to aid in hearing.
b. Designed to absorb or control sound: acoustic tile.
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.