I. ˈȯ-dē-ˌō adjective
Etymology: audio-
Date: 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 especially 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
II. noun
Date: 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