Arbitrator

Part of speech: noun (n.)

1. A person, or one of two or more persons, chosen by parties who have a controversy, to determine their differences. See Arbitration.

2. One who has the power of deciding or prescribing without control; a ruler; a governor. Though Heaven be shut, And Heaven's high Arbitrators sit secure. Milton. Masters of their own terms and arbitrators of a peace. Addison.

Synonyms: Judge; umpire; referee; arbiter. See Judge.