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One hit with this meaning, whole bunch with computing contexts. --Connel MacKenzie 16:02, 5 March 2007 (UTC)
Here are a few examples:
Glenn Yeffeth, ed., The Man from Krypton: A Closer Look at Superman (2006) p. 155:
It's a little trick called retcon, short for "retroactive continuity," ...
Yet I'm unsure even Millar is fully aware of the power given him by the retcon.
Len Wein, ed., The Unauthorized X-Men: SF and Comic Writers on Mutants, Prejudice, and Adamantium (2006) 92:
Retroactive continuity (aka retconning), would reveal that Quicksilver and Scarlet Witch are also Magneto's children, showing that this was a guy who was really committed to his cause
Michael Eury, Daniel (CON) Best, Glen (CON) Cadigan, Mike (CON) Esposito, David (CON) Mandel, The Krypton Companion (2006) p. 157:
Luthor appeared a handful of times, Gary "retconned" the Toyman and created Terra-Man, and Superman would get a worthy opponent whenever Len Wein did a fill-in.
Rhonda Wilcox, Why Buffy Matters: The Art of Buffy the Vampire Slayer (2005) p. 9:
Fans talk of retcon—retroactive continuity—giving information that explains an earlier event, especially seeming plot contradictions or lacunae.
Eric Nolen-Weathington, Modern Masters Volume 3: Bruce Timm (2004) p.79:
A lot of people were like, "Oh, they just retconned their own continuity. They should have used Kyle. I don't like that." So we just threw Kyle in there to say, "No, no, Kyle's still there. He still exists in the animated universe; he's just not stationed on Earth at the moment, regularly."
Glen Cadigan, The Legion Companion (2003) p. 152:
TLC: What do you say to the Legion fans who have become disenfranchised with the series due to its various retcons and reboots?
Jean-Marc Lofficier, The Nth Doctor (2003) p. 5:
While ‘retconning' the scripts, I came up with a number of theories that throw new light on the Doctor, his past, and various other elements...