The definition comes from the movie (Spider-Man: Across the Spider-Verse) it is an inevitable event or action good or bad that is supposed to happen that results your future self.
for example a Canon event can be the the time where peter parker became Spider-man because he got bit by a mutated spider and that his uncle got murdered by a burglar which in result made him want to do justice and become a superhero
by KingMorales June 07, 2023
Used mostly by fanfic writers, post canon describes a storyline that continues on after the original plot finishes.
My story begins post canon
by Stately dancer November 26, 2019
An event in someone's life that must happen, in order to keep the balance of the multiverse and a development in their storyline. If you happen to change or distrupt it, the multiverse will collapse.
by anjinglah June 07, 2023
by mercifuil September 17, 2023
In terms of fandom, a canon nazi is a person who strictly adheres to canon, with no deviation whatsoever. A canon nazi is not necessarily a creator of fanfic or fanart, and can just be someone who enjoys other fanworks adhering to canon (or complains about crackfic and other non-canon compliant works).
A: Did you read the fanfic about Draco and Snape?! Omg so hot.
B: No, I don't really like non-canon pairings.
A: OMG CANON NAZI
B: No, I don't really like non-canon pairings.
A: OMG CANON NAZI
by xyv September 23, 2009
An event everyone must go through to keep the universe intact. Typically this event has effects on character development
by geometric123 June 16, 2023
An idea or opinion about a fictional series (Book, TV, Comic, or otherwise) that is true in one's head, but has not become a canon fact.
by Nellaxival August 04, 2011