word-forming element meaning "sound, hearing," from combining form of Latin audire "to hear" (from PIE root *au- "to perceive"); used in English word formation by 1890s.
Entries linking to audio-
*au-
Proto-Indo-European root meaning "to perceive."
It forms all or part of: aesthete; aesthetic; anesthesia; audible; audience; audio; audio-; audit; audition; auditor; auditorium; auditory; hyperaesthesia; kinesthetic; oyer; oyez; obedient; obey; paraesthesia; synaesthesia.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit avih, Avestan avish "openly, evidently;" Greek aisthanesthai "to feel;" Latin audire "to hear;" Old Church Slavonic javiti "to reveal."
audio n.
"sound," especially recorded or transmitted sound signals, 1934, abstracted from word-forming element audio- (q.v.), which is from Latin audire "to hear" (from PIE root *au- "to perceive").