soundtracknoun/ˈsaʊndˌtɹæk/

• 1

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

• 2

  The sound (especially the music) component of a movie, video game, etc.

• 3

  A recording or compilation of recordings of such music for sale.

• 4

  A background sound that is part of a larger event.

  • There was a startling lack of creativity and if Van Gaal had listened closely he would have made out the mocking chants from the away end, as the visiting fans embarked on the repertoire of songs that formed the soundtrack to David Moyes’s time in the job.
• 5

  Popular music associated with a particular historical era or time of one's life, especially nostalgically.

  • the soundtrack of our relationship
  • CDs, iPods, and other forms of digital downloading, large numbers of specialty music channels or digitalized television services, satellite radio, and related media, all mean that anyone interested in the soundtrack of the sixties can access any song at any time in almost any place — a dream unbelievable to a sixties teen carrying his or her transistor radio.

soundtrackverb/ˈsaʊndˌtɹæk/

• 1

  To provide, or to act as, the sound or music component of a film.

  • The world, in turn, watched, clicked, cried, danced, sang along, swooned, caravanned to stadiums and movie theaters, let her work soundtrack their lives.