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.
- Sports A person appointed to rule on plays, especially in baseball.
- A person appointed to settle a dispute that mediators have been unable to resolve; an arbitrator. See Synonyms at judge.
- To act as referee for; rule or judge.
- To be or act as a referee or an arbitrator.