DuckCorp Dico

Found one definition

1.                 From The Jargon File (version 4.4.7, 29 Dec 2003):
                   
   
   
                   
                     
   con
    n.
       [from SF fandom] A science-fiction convention. Not used of other sorts of
       conventions, such as professional meetings. This term, unlike many others
       imported from SF-fan slang, is widely recognized 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.”