Electronics. designating an electronic apparatus using audio frequencies: audio amplifier.
of, relating to, or employed in the transmission, reception, or reproduction of sound.
of or relating to frequencies or signals in the audible range.


  1. the audio elements of television (distinguished from video).
  2. the circuits in a receiver for reproducing sound.
  3. the audio part of a television broadcast.
the field of sound recording, transmission, reception, and reproduction.

Origin of audio

First recorded in 1920–25; independent use of audio-


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).

Origin of audio-

< Latin audī- (stem of audīre to hear) + -o- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for audio

Contemporary Examples of audio

Historical Examples of audio

  • The image now was silent, for Halsey was not bothering with audio connection.

    Wandl the Invader

    Raymond King Cummings

  • It's audio of some sort, sir, but there's lots more to the signal than that.

  • "Pick him up," the Captain turned and ordered the audio controller.

    The Circuit Riders

    R. C. FitzPatrick

  • The Captain was on an audio circuit, talking to an Assistant Commissioner.

    The Circuit Riders

    R. C. FitzPatrick

  • Though all stations were on the screen at all times, their audio channels could be controlled.


    Harry Harrison

British Dictionary definitions for audio


noun (modifier)

of or relating to sound or hearingaudio frequency
relating to or employed in the transmission, reception, or reproduction of sound
of, concerned with, or operating at audio frequencies
Compare video

Word Origin for audio

C20: independent use of audio-


combining form

indicating hearing or soundaudiometer; audiovisual

Word Origin for audio-

from Latin audīre to hear
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for audio

"sound," especially recorded or transmitted, 1934, abstracted from prefix audio- (in audio-frequency, 1919, etc.), from Latin audire "hear" (see audience).


word-forming element meaning "sound, hearing," from comb. form of Latin audire "hear," (see audience); first used in English as a word-formation element 1913.

Online Etymology Dictionary, © 2010 Douglas Harper

audio in Medicine



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.