Sound recording on a narrow strip of a motion picture film WordNet 3.0 & Open English WordNet

A soundtrack is recorded sound accompanying and synchronised to the images of a book, drama, motion picture, radio program, television program, or video game; colloquially, a commercially released soundtrack album of music as featured in the soundtrack of a film, video, or television presentation; or the physical area of a film that contains the synchronised recorded sound. Wikipedia

The recorded sound accompanying a visual medium such as a motion picture, television show, or video game Wikipedia Disambiguation

Recorded music accompanying and synchronized to the images of a motion picture, television program or video game. Wikipedia Disambiguation

Recorded music accompanying and synchronized to the images of a motion picture, book, television program, or video game; a commercially released soundtrack album of music as featured in the soundtrack of a film, video Wikidata

A narrow strip running down a movie film that carries the recorded sound in synchronization with the pictures. Wiktionary