Fan: N. Without Qualification, Indicates A Fan Of Science Fiction, Especially One Who Goes To {con}s And Tends To Hang Out With Other Fans.

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:fan: n. Without qualification, indicates a fan of science
fiction, especially one who goes to {con}s and tends to hang out
with other fans. Many hackers are fans, so this term has been
imported from fannish slang; however, unlike much fannish slang it
is recognized by most non-fannish hackers. Among SF fans the
plural is correctly `fen', but this usage is not automatic to
hackers. "Laura reads the stuff occasionally but isn't really a
-- The AI Hackers Dictionary