What is the meaning of Acoustic?

Pertaining to the sense of hearing, the organs of hearing, or the science of sounds.

Used for soundproofing or modifying sound.

Using sound energy in its operation.

Able to be set off by sound waves.

Naturally producing or produced by an instrument without electrical amplification or the need thereof.

Non-electric; mechanical.

Euphemistic form of autistic.

The properties or qualities of a room or building that determine how sound is transmitted in it.

A medicine or other agent to assist hearing.

Clipping of acoustic guitar.

Source: wiktionary.org