arbitrate (v.) Look up arbitrate at Dictionary.com
1580s, "act as an umpire, mediate, decide, determine, give an authoritative decision," from Latin arbitratus, past participle of arbitrari "be of an opinion, give a decision," from arbiter "a judge, umpire, mediator" (see arbiter). Meaning "act as an arbitrator" is from 1610s. Related: Arbitrated; arbitrating; arbitrable (1530s). The earlier verb form was arbitren "decide a dispute by arbitration" (early 15c.).