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From The Collaborative International Dictionary of English v.0.48:
Umpire \Um"pire\, v. t. [imp. & p. p. Umpired; p. pr. & vb. n. Umpiring.] 1. To decide as umpire; to arbitrate; to settle, as a dispute. [1913 Webster] Judges appointed to umpire the matter in contest between them, and to decide where the right lies. --South. [1913 Webster] 2. To perform the duties of umpire in or for; as, to umpire a game. [Colloq.] [1913 Webster]