the narrow band on one or both sides of a motion-picture film on which sound is recorded.
the sound recorded on a motion-picture film; audio portion of a film.
the music or dialogue from a film available on a commercial recording.

1925–30; sound1 + track Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
soundtrack (ˈsaʊndˌtræk)
1.  Compare commentary the recorded sound accompaniment to a film
2.  a narrow strip along the side of a spool of film, which carries the sound accompaniment
3.  (tr) to provide a continuous accompaniment of sounds, esp music

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The players require a bit of work to produce your personal soundtrack, but not
The soundtrack is a fictionalized dialogue spoken between the residents of the
  building in the outside hallways.
The video lacks any music, so you'll need to add your own soundtrack.
The video features slick animation, an ominous soundtrack, and interviews with
  indebted students and critical professors.
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