um•pire
Pronunciation: (um'pīr), [key] — n., v., -pired, -pir•ing.
—n. - a person selected to rule on the plays in a game.
- one selected to settle disputes about the application of settled rules or usages; a person agreed on by disputing parties to arbitrate their differences.
—v.t. - to act as umpire in (a game).
- to decide or settle (a controversy, dispute, or the like) as umpire; arbitrate.
—v.i. - to act as umpire.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.