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FanFiction

Because there are so many assheads in this world you can read the definition of fanfiction explained in multiple ways here:

fan·fic(·tion)

/ˈfænˌfɪk/

noun, Informal.

1.

A piece of fiction within a fandom utilizing characters and situations from a pre-existing work including (but not limited to) books, television programs, films, and comic strips.

~Dictionary.com

2.

Definition: Fanfiction is when someone takes either the story or characters (or both) of a certain piece of work, whether it be a novel, tv show, movie, etc, and create their own story based on it. Sometimes people will take characters from one movie and put them in another, which is called a cross-over.

~Urban Dictionary

3. 

Fiction written around previously established characters invented by other authors.

~Dictionary.com

4.

A story based within a pre-existing world, which may or may not include canonical (canon) characters as major or minor actors. Usually also includes non-canon characters, commonly referred to as OCs among the community. Though technically canon characters are also OCs, stories that focus majorly or entirely around OCs are considered 'OC fiction', or 'OC stories.'

~Urban Dictionary

5.

Fiction written by fans for other fans about the fandoms that they like. Usually, the author takes the characters and/or the setting of the fandom and writes a new or continuing plot. Sometimes they write crossovers.  

~Urban Dictionary

6.

A work of fiction utilizing characters from a book, television show, or movie, as opposed to original characters. Referred to as "fan" fiction because it is generally written by fans obsessed with the book, television show, or movie.  

~Urban Dictionary

Yes, you did just read the definition of FanFiction explained in 6 different ways.