an edited version of a movie that has not been altered by a studio and over which its director has complete artistic control.
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British Dictionary definitions for director's cut
films a version of a film which realizes the artistic aims of the director more fully than the original version
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