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A literary, dramatic, or cinematic work whose narrative takes place before that of a preexisting work in the same series.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Film) a film or book about an earlier stage of a story or a character's life, released or published because the later part of it has already been successful
[C20: from pre- + (se)quel]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a sequel to a film, play, or piece of fiction that prefigures the original, as by portraying the same characters at a younger age.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.