"umpire" in the noun sense
1. umpire, ump
an official at a baseball game
2. arbiter, arbitrator, umpire
someone chosen to judge and decide a disputed issue
"the critic was considered to be an arbiter of modern literature"
"the arbitrator's authority derived from the consent of the disputants"
"an umpire was appointed to settle the tax case"
"umpire" in the verb sense
1. referee, umpire
be a referee or umpire in a sports competition
Source: WordNet® (An amazing lexical database of English)
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