Synonyms and related words :
agential, agentival, agentive, arbitrational, arbitrative, assisting, coming between, conducive, employable, facilitating, favoring, forwarding, going between, handy, helpful, instrumental, intercessional, intercessory, interlocutory, intermedial, intermediary, intermediate, intermediatory, intervening, interventional, mediative, mediatorial, mediatory, mesne, middle, ministerial, ministering, pacificatory, promoting, serviceable, subservient, useful