audio \audio\ 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. "they always raise the audio for
   commercials"

   Syn: sound.
        [WordNet 1.5]

   2. 1 an audible acoustic wave frequency.

   Syn: audio frequency
        [WordNet 1.5]

   3. the sound elements of television.
      [WordNet 1.5]