arbitrator Definition

arbitrate
verb arbitrated, arbitrating

intr
1. To help the parties involved in a dispute or disagreement find grounds for agreement.
2. To submit to or settle by arbitration.

Thesaurus: settle, decide, determine, adjudicate, judge, referee, umpire.

Derivative: arbitrator
noun

Someone who helps to settle disputes by negotiation
Thesaurus: arbiter, adjudicator, negotiator, intermediary, mediator, moderator, judge, referee, umpire.

Etymology: 16c: from Latin arbitrari to give a judgement.