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1.
Uncap is term used in multiplayer games for area that can not be captured.
Usually server rules say that no attacks on that area are allowed.
NO ATTACKS ON UNCAP OR KICKED
by Holett April 21, 2009
 
2.
UNCAP short for uncapturable. The UNCAP is a point (flag) which may not be captured and (thus uncapturable) by the other team. The UNCAP is often the spawn area in a Conquest or Domination type multi-player game within a First Person Shooter (FPS) which has other points (flags) which can be captured by either team.
Hey Jonny, spawn at the UNCAP, get the tank and bring it to Bravo.
by JonnyHodgie August 24, 2010