1) A musical instrument that is not electric
2) A musical performance that uses no electric instruments (aside from microphones and similar amplification)
1) Jimi Hendrix played an electric guitar on the song "Purple Haze", but Paul Simon played an acoustic guitar on Simon & Garfunkel's "Mrs. Robinson". Techno and dance music uses electric drums, but rock music typically sticks to acoustic drums.

2) Eric Clapton's band did an acoustic show on "Mtv Unplugged".
by Bill M. August 28, 2004
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Autistically attracted to music
person: *enjoying bad music*
some guy: YoU'rE aCoUsTiC
person: 00F
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acoustic means loved and cared by all forms of life and also by Jesters.
King: How are you today my Queen.
Queen: I feel acoustic as if I am one with nature.
by Administaratorororor November 11, 2019
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Real, not artificial; technologically and stylistically simple, like acoustic vs. electric guitar music.
This hand-made wood furniture is really acoustic.
by octopod November 12, 2003
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a musical instrument which produces its normal sound through the sounding board and is not amplified in any way
Mumford and Sons is an Acoustic Band, that uses all Acoustic instruments.
by ilovemumfordmorethenanything September 25, 2012
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A word to describe Cleavage, the space in your mouth while giving a blow-job, or how tight you are.
Mmmmm that girl's got some nice acoustics!
by asmondaus March 30, 2010
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