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The Free On-line Dictionary of Computing (foldoc)

/ret'kon/ retroactive continuity.

The common situation in fiction where a new story "reveals"
things about events in previous stories, usually leaving the
"facts" the same (thus preserving continuity) while completely
changing their interpretation. For example, revealing that a
whole season of "Dallas" was a dream was a retcon.

This term was once thought to have originated on the {Usenet}
newsgroup {news:rec.arts.comics} but is now believed to have
been used earlier in comic fandom.

[{Jargon File}]

(1994-12-08)