con(redirected from certificate-of-necessity)
Also found in: Dictionary, Thesaurus, Medical, Legal.
con(esp US), conn Nautical
the place where a person who cons a vessel is stationed
[SF fandom] A science-fiction convention. Not used of other sorts of conventions, such as professional meetings. This term, unlike many others of SF-fan slang, is widely recognised even by hackers who aren't fans. "We'd been corresponding on the net for months, then we met face-to-face at a con."