[1] : The Collaborative International Dictionary of English v.0.48

compo \com"po\, n.; pl. -pos.
   short for composition; -- used, esp. in england, colloq. in
   various trade applications; as :
   a a mortar made of sand and cement.
   b a carver's mixture of resin, whiting, and glue, used
       instead of plaster of paris for ornamenting walls and
       cornices.
   c a composition for billiard balls.
   d a preparation of which printer's rollers are made.
   e a preparation used in currying leather.
   f composition paid by a debtor.
       webster 1913 suppl.
see also:
-pos composition 

[2] : Jargon File (4.3.1, 29 Jun 2001)

compo n. demoscene finnish-originated slang for `competition'. demo
   compos are held at a demoparty. the usual protocol is that several
   groups make demos for a compo, they are shown on a big screen, and then
   the party participants vote for the best one. prizes from sponsors and
   party entrance fees are given. standard compo formats include intro
   compos 4k or 64k demos, music compos, graphics compos, quick demo
   compos build a demo within 4 hours for example, etc.


see also:
demoscene demoparty intro demo 

Compo >> C Words
Compo, definition of term: Compo
compo_pag1.html