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A term applied to the canon of TV creator and filmmaker Joss Whedon: Buffy the Vampire Slayer, Angel the Series, Firefly, Serenity, and others. It is frequently used when referring to fanworks created within these universes: "My current fandoms are all in the Jossverse."
The extended Jossverse
Others feature familiar canon characters, and are supposed to take place in between aired episodes, like a missing scene.
Although technically part of the Jossverse, many fans personally consider them non-canon.
See also: virtual season.