Update: After coming back to this node after several years, the links below appear to be busted. Your best bet is to google "Jargon File" since there appear to be many locations of this and I'm not sure when ESR will move this again :-)

Check out the jargon file at ...

http://www.tuxedo.org/~esr/jargon/html/index.html

... or more specifically ...

http://www.tuxedo.org/~esr/jargon/html/The-Jargon-Lexicon.html

bluto