ARBITRATOR. A private extraordinary judge chosen by the parties who have a matter in dispute, invested with power to decide the same. Arbitrators are so called because they have generally an arbitrary power, there being in common no appeal from their sentences, which are called awards. Vide Caldw. on Arb. Index,. h. t.; Kyd on Awards, Index, h. t. 3 Bouv. Inst. n. 2491.