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1. Electronics.designating an electronic apparatus using audio frequencies: audio amplifier.
2. of, pertaining to, or employed in the transmission, reception, or reproduction of sound.
3. of or pertaining to frequencies or signals in the audible range.
a. the audio elements of television (distinguished from video).
b. the circuits in a receiver for reproducing sound.
c. the audio part of a television broadcast.
2. the field of sound recording, transmission, reception, and reproduction.
a combining form used in the formation of compound words, with the meanings: “sound within the range of human hearing” (audiometer); “hearing” (audiology); “sound reproduction” (audiophile).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.