1580s (arbitrable is recorded from 1530s), "to give an authoritative decision," from Latin arbitratus, past participle of arbitrari "be of an opinion, give a decision," from arbiter (see arbiter). Meaning "to act as an arbitrator" is from 1610s. Related: Arbitrated; arbitrating. The earlier verb form was arbitren (early 15c.).
1. to arbitrate in a dispute
2. He was asked to arbitrate between management and the unions.
3. Someone must arbitrate between them.
4. The tribunal had been set up to arbitrate in the dispute.
5. France was asked to arbitrate the dispute between the two nations.