Longman Dictionary of Contemporary English
Wiktionary
alt. 1 A TV broadcast etc., in which pictures are accompanied by the voice of an unseen actor or reporter. 2 The audio track of such a broadcast. n. 1 A TV broadcast etc., in which pictures are accompanied by the voice of an unseen actor or reporter. 2 The audio track of such a broadcast.
Wikipedia
Voice-over (also known as off-camera or off-stage commentary) is a production technique where a voice—that is not part of the narrative (non- diegetic)—is used in a radio, television production, filmmaking, theatre, or other presentations. The voice-over is read from a script and may be spoken by someone who appears elsewhere in the production or by a specialist voice talent. It is usually pre-recorded and placed over the top of a film or video and commonly used in documentaries or news reports to explain information. Voiceover is used in video games and on-hold messages, as well as for announcements and information at events and tourist destinations. It may also be read live for events such as award presentations.
Usage examples of "voice-over".
The bits that needed voice-over would be played to her and a green light would tell her when to start talking, the timecode was also printed on her script and that told her when she needed to stop speaking by.
As I shuffled down the aisle with my Orwell and my pint, and as an hysterical voice-over blurbed the coming attractions ('.
A sonorous voice-over pumped out relentless adspeak about the technical expertise behind the project: glory, glory, glory to the heroes of the genetic revolution.
MAPHIS didn't understand anything about TV journalism, personality conflicts on the job, promotions, turf battles, rewrites, video edits, voice-overs, all the everyday details of Sharon's work.
In Calgary, Alberta, a reporter for a local paper who'd never got over her crush on Dwayne Hickman was startled by the picture and the voice-over, and called her city desk.
Supposed to be marital aids for couples with sexual dysfunction, pseudodocumentaries with a disclaimer at the beginning and some guy who sounds like Orson Welles doing a voice-over narration while the camera zooms in on insertion.
At least the studio was in a part of London where a lot of the best voice-over studios were, north of Oxford Street in the garment district which spreads east from Regent Street for a couple of blocks till it runs up against the straggle of the Middlesex Hospital's many outstations of sickness.
The voice-over of the newscaster will be saying how the sole survivor of America's latest death cult, the Creedish, is on suicide watch following the tragic string of suicides that one by one have claimed the lives of the remaining cult survivors.