say it: AH-dee-oh
audio is a noun meaning "the audible part of a transmitted signal". It carries 4 recorded senses.
the audible part of a transmitted signal
“they always raise the audio for commercials”
an audible acoustic wave frequency
a recording of acoustic signals
the sound elements of television
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for audio come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.