soundtrack

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

Origin of soundtrack

First recorded in 1925–30; sound1 + track
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for soundtrack

soundtrack

noun
  1. the recorded sound accompaniment to a filmCompare commentary (def. 2)
  2. a narrow strip along the side of a spool of film, which carries the sound accompaniment
verb
  1. (tr) to provide a continuous accompaniment of sounds, esp music
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for soundtrack
n.

1929, from sound (n.1) + track (n.).

Online Etymology Dictionary, © 2010 Douglas Harper