Ficathon: refers to a multi-participant challenge and writing fest in which authors are invited to submit story ideas in return for writing another author's prompt. Often, but not always, participation is anonymous until a later date. Ficathons often run based on a particular theme, but can be anything. Stories are usually beta'd prior to posting.
See also: Big Bang, Challenge and/or Prompt
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A-Z Fanfiction Guide: Terms to Know
RandomAn A-Z List of all the fanfic terms YOU should know! (Cr. Goes to Angerfire.com for references and information) * this will be updated periodically, so if some things are missing, they haven't been added yet.