Webster's English Dictionary

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umpire

1. um.pire \'*m-.pi-(*)r\ n [ME oumpere, alter. (resulting fr. incorrect 
   division of a noumpere]) of noumpere, fr. MF nomper not equal, not paired, 
   fr. non- + per equal, fr. L par 1: one having authority to decide finally a 
   controversy or question between  parties : as 1a: one appointed to decide 
   between arbitrators who have disagreed  1b: an impartial third party chosen 
   to arbitrate disputes arising under the  terms of a labor agreement 2: an 
   official in a sport who rules on plays  3: a military officer who evaluates 
   maneuvers 
2. umpire vt : to supervise or decide as umpire to act as umpire