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From The Collaborative International Dictionary of English v.0.48:
Arbitrator \Ar"bi*tra`tor\, n. [L., fr. arbitrari: cf. F. arbitrateur.] 1. A person, or one of two or more persons, chosen by parties who have a controversy, to determine their differences. See Arbitration. [1913 Webster] 2. One who has the power of deciding or prescribing without control; a ruler; a governor. [1913 Webster] Though Heaven be shut, And Heaven's high Arbitrators sit secure. --Milton. [1913 Webster] Masters of their own terms and arbitrators of a peace. --Addison. [1913 Webster] Syn: Judge; umpire; referee; arbiter. See Judge. [1913 Webster]