| Arbitrator 1. (n.) A person, or one of two or more persons, chosen by parties who have a controversy, to determine their differences. See Arbitration. 2. (n.) One who has the power of deciding or prescribing without control; a ruler; a governor. Thesaurus Entries JP, Justice, arbiter, bencher, broker, connection, contact, critic, go-between, his honor, his lordship, his worship, impartial arbitrator, indicator, interagent, intermediary, intermediate, intermedium, internuncio, interpleader, judge, justice, magistrate, mediator, medium, middleman, moderator, negotiant, negotiator, referee, third party, umpire, unbiased observer |