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English word audio comes from Proto-Indo-European *dʰeh₁-, Proto-Indo-European *h₂ewis, Proto-Indo-European *h₂ow-
*dʰeh₁- (Proto-Indo-European)
*h₂ewis (Proto-Indo-European)
*h₂ow- (Proto-Indo-European)
*h₂ew-is-d- (Proto-Indo-European)
audire (Latin)
audio (English)
Of or relating to audible sound.. Of or relating to the broadcasting or reproduction of sound, especially high-fidelity reproduction. A sound, or a sound signal.