[au.dio] adj [audio-] (1916) 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 hertz
2. a: of or relating to sound or its reproduction and esp. high-fidelity reproduction b: relating to or used in the transmission or reception of sound--compare video c: of, relating to, or utilizing recorded sound
[2]audio n (1934) 1: an audio signal; broadly: sound
2: the section of television or motion-picture equipment that deals with sound
3: the transmission, reception, or reproduction of sound