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soundtrack

[sound-trak] /ˈsaʊndˌtræk/
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
1925-1930
1925-30; sound1 + track
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sound track

soundtrack

/ˈsaʊndˌtræk/
noun
1.
the recorded sound accompaniment to a film Compare commentary (sense 2)
2.
a narrow strip along the side of a spool of film, which carries the sound accompaniment
verb
3.
(transitive) 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
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Encyclopedia Article for sound track

in motion-picture technology, narrow band, usually along the margin of the film, that carries the photographic or magnetic sound record. In optical recording systems, sound waves modulate a beam of light; the sound track, which may be of variable density or of variable width, is a photographic record of the varying light. For sound reproduction, a beam of light is passed through the sound track onto a photocell connected, through an amplifier, to a loudspeaker. This optical system is the basic plan of sound reproduction in sound motion pictures. In stereophonic sound recording, a number of such bands may be used on the same film

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Word Value for sound

6
8
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