"retcon"

[Jonathan Lighter]

>From Wikipedia :

  Retroactive continuity – commonly contracted to the portmanteau retcon – is the adding of new information to "historical" material, or deliberately changing previously established facts in a work of serial fiction. The change itself is referred to as a retcon, and the act of writing and publishing a retcon is called "retconning".

  The article offers many details.

  JL


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