umpire

n. Person enforcing rules and settling disputes in esp. Cricket or between disputants. v. (-ring) (often foll. By for, in, etc.) Act as umpire (in). [french nonper not equal: related to *peer2]

n. A person to whose sole decision a controversy or question between parties is referred; especially, one chosen to see that the rules of a game, as cricket, baseball, or the like, are strictly observed.