What is another word for "mediate"?

Roget's Thesaurus (1911) lists these synonyms for "mediate": accoucheur, accoucheuse, agency, aid, along, arbitrate, arbitration, arbitrator, assistance, bargain, compromise, conducive, consignee, crook, dint, diplomacy, diplomatics, diplomatist, expedient, fair, flag, foul, go-between, good, halfway, hand, handmaid, hereby, hook, instrument, instrumental, instrumentality, intercede, intercession, intercessor, interfere, interference, intermeddling, intermediate, intermedium.