Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to humanly audible sound.
  • adj. Of or relating to the broadcasting, reproduction, or reception of sound.
  • adj. Of or relating to high-fidelity sound reproduction.
  • n. The part of television or movie equipment that has to do with sound.
  • n. The broadcasting, reception, or reproduction of sound.
  • n. Audible sound.
  • n. A sound signal: lost the audio during the broadcast.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or relating to audible sound.
  • adj. Of or relating to the broadcasting or reproduction of sound, especially high-fidelity reproduction.
  • n. A sound, or a sound signal

from the GNU version of the Collaborative International Dictionary of English

  • n. the part of a transmitted signal which conveys the sound of the event represented by the signal, such as that of a television program.
  • n. an audible acoustic wave frequency.
  • n. the sound elements of television.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the audible part of a transmitted signal
  • n. a recording of acoustic signals
  • n. an audible acoustic wave frequency
  • n. the sound elements of television

Etymologies

From audio-.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin audiō ("hear, listen") (Wiktionary)

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