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