Synonyms:
arbiter, arbitrator, umpire
Meaning: someone chosen to judge and decide a disputed issue; "the critic was considered to be an arbiter of modern literature"; "the arbitrator's authority derived from the consent of the disputants"; "an umpire was appointed to settle the tax case"
Usage examples
An arbitrator of disputes is no use to me.
At Last Pompey Is Made The Arbitrator Of The Dispute Between The Brothers.