retcon
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ret·con
(rĕt′kŏn′)n.
The depiction of fictional events, as in a television series or comic book, that entail a revision of the narrative presented in an earlier installment.
tr.v. ret·conned, ret·con·ning, ret·cons
To modify (a fictional character, for example) in this manner.
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.