-.ˌtrād.ə(r), -ātə- noun
( -s )
Etymology: Middle English arbitratour, from Middle French, from Late Latin arbitrator, from Latin arbitratus (past participle of arbitrari to render judgment) + -or — more at arbitrate
1. : a person or one of two or more persons chosen to settle by arbitration the differences between two parties in controversy : conciliator — distinguished from mediator
2. : one with absolute power of deciding : arbiter
made himself the arbitrator of his own destiny — Geoffrey Clive