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Definition of acoustic
1relating to sound or the sense of hearing:dogs have a much greater acoustic range than humans (of building materials) used for soundproofing or modifying sound:acoustic tiles (of an explosive mine or other weapon) able to be set off by sound waves. 2(of music or musical instruments) not having electrical amplification:acoustic guitar (of a person or group) playing musical instruments without electrical amplification.
) the properties or qualities of a room or building that determine how sound is transmitted in it:Symphony Hall has perfect acoustics
) [treated as singular] the branch of physics concerned with the properties of sound.
3a musical instrument without electrical amplification, typically a guitar.