the act of reproducing a sound or video recording, especially in order to check a recording that is newly made.
(in a recording device) the apparatus used in producing playbacks.
the recording so played, especially the first time it is heard or viewed after being recorded.
the response to a suggestion, act, product, venture, etc.; feedback: The playback on the speech has been very favorable.

1925–30; noun use of verb phrase play back Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
playback (ˈpleɪˌbæk)
1.  the act or process of reproducing a recording, esp on magnetic tape
2.  the part of a tape recorder serving to reproduce or used for reproducing recorded material
3.  (modifier) of or relating to the reproduction of signals from a recording: the playback head of a tape recorder
4.  to reproduce (recorded material) on (a magnetic tape) by means of a tape recorder

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Speech recognition and speech playback software expand the realizations of text
  into auditory as well as visual experiences.
The software also organizes your recordings for easy playback.
Translucent playback controls only appear as needed when you mouse over a movie.
Ledger trots his horse over to the playback monitor and pries the helmet from
  his head.
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