RhymeZone: voice-over definitions

Definitions of voice-over:

noun: A production technique, in which pictures are accompanied by the voice of an unseen actor or reporter.
noun: A voice-overed release, especially of foreign content.
noun: The voice audio track of such a broadcast.
verb: (transitive, intransitive) To supply the voice audio track for (a broadcast).

(Definitions from Wiktionary)