audio

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or relating to recorded, transmitted, or reproduced sound.
• adjective Of or relating to humanly audible sound.
• noun Recorded or reproduced sound.
• noun Audible sound.
• noun A sound signal or recording.
• noun The part of television or movie equipment that has to do with sound.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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