audio Syllabification: (au·di·o)Pronunciation: /ˈôdēˌō/Translate audio | into French | into German | into Italian Definition of audio noun [usually as modifier] sound, especially when recorded, transmitted, or reproduced:audio equipment the machine can retrieve and play audio from a CD-ROMOrigin: 1930s: independent usage of audio-audio in other Oxford dictionaries Definition of audio in the British & World English dictionary