umpire
(noun)
ˈəmˌpī(ə)r
Definitions
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An official who watches a game or match closely to enforce the rules and arbitrate on matters arising from the play.
A sentinel of sport, weaving through the lattice of rules, casting balance upon the grand stage where athletes dream.Example: The umpire called the runner out at home plate.
Origin
Middle English (originally as noumpere) from Old French nonper, from non 'not' + per 'equal' (used in the sense ‘assigned to decide’): the n was lost by wrong division of a noumpere.
Synonyms
referee, arbiter, judge, adjudicator