ar·bi·trate /'är-bə-ˌtrāt/ vb -trat·ed, -trat·ing
vt
1: to act as arbitrator for
2: to bring to arbitration for settlement
agreed to arbitrate their dispute
vi: to act as arbitrator
ar·bi·tra·tive /-ˌtrā-tiv/ adj
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.