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Musical acoustics, the branch of acoustics that studies the physics of music;
;
Acoustic meatus, another name for the ear canal;
In music:
Acoustic instrument, as opposed to an electric instrument;
Acoustic music, music that solely or primarily uses acoustic instruments;
Acoustic guitar, as opposed to electric guitar;
Acoustic bass guitar, as opposed to electric bass guitar;
Acoustic (Deine Lakaien album), 1995;
Acoustic (John Lennon album), 2004;
Other:
Acoustic Control Corporation, a company which produced instrument amplifiers using Acoustic as a brand name;
Acoustic thermometry, observation of the oceans' climates using long-range acoustic instruments;
Acoustic cryptanalysis, in cryptography, a side channel attack which exploits sounds;