Webster's English Dictionary

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audio

1. au.dio \'o.d-e--.o-\ aj [audio-] 1: of or relating to acoustic, 
   mechanical, or electrical frequencies corresponding to normally audible 
   sound waves which are of frequencies approximately from 15 to 20, 000 
   cycles per second 2a: of or relating to sound or its reproduction and esp. 
   high-fidelity rep roduction 2b: relating to or used in the transmission or 
   reception of sound 
2. audio n 1: the transmission, reception, or reproduction of sound  2: the 
   section of television equipment that deals with sound