Audio means to do with recorded sound. Audio quality, an audio file, audio description.
Audio description is the narrated track that describes what is happening on screen for blind and partially sighted viewers, and it is required by law on much broadcasting. As a noun, the audio means the sound track itself. The Latin audire means to hear.
1adjectiveaudioTo do with recorded sound.
“You can download the audio version of the book and listen to it in the car.”
audio is a quality of sound.
From Latin audire, to hear, taken as a prefix and then used alone. Audience and audition come from the same hearing.
Proto-Indo-European
*h₂ew-
English, today
audio
a clipping of audio-. Cognates include Sanskrit आविस् (“manifestly, evidently”) and Ancient Greek αἰσθάνομαι (“perceive, notice”) whence English aesthetic.
Etymology from Wiktionary, CC BY-SA