Reverse Dictionary: ARBITRATE

NOUNS, PERSON
1400 ► UMPIRE an arbitrator; a person who decides between disputants or contending parties and whose decision is usually accepted as final 
1482 ► WARDSMAN an arbitrator → obs.
1489 ► DAYSMAN an arbitrator or umpire; a mediator → arch.
1556 ► MODERATOR a person who acts as an arbitrator between disputants; an arbiter, an umpire, a judge 
1563 ► DECISOR an arbitrator; a person who decides causes or controversies; a decider → obs.
1581 ► ODDSMAN an arbiter; an umpire → Sc. obs.
1587 ► ODDWOMAN an arbitress; a female umpire → Sc. obs.
1793 ► THIRDSMAN an arbiter between two → Sc.

VERBS
..825 ► DEEM to arbitrate; to act as judge, to sit in judgement; to give one’s decision, sentence, or opinion ​→ obs.