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Definition of intermediary : 1. Lying, coming, or done, between; intermediate; as, an intermediary project.
2. One who, or that which, is intermediate; an interagent; a go- between.

Synonyms:

intermediate, intermediator, medium, instrumentality, mechanism, instrumentation, interceder, mean, means, intercessor, organ

deputy, middleman, impresario, actor, broker, liaison, appointee, factor, delegate, instrument, operative, executor, representative, ombudsman, agent, lieutenant, emissary, mediator, agency, surrogate, substitute, proxy, vehicle, go-between, attorney, alternate, auxiliary, second

Usage examples:

• The priest was no longer simply the guardian of sacred traditions, the intermediary between man or the state and the gods, but also a spiritual guide. - "The Oriental Religions in Roman Paganism", Franz Cumont.
• M. le Marquis had always been the intermediary for her letters, you understand, and for the small sums of money which she had sent from time to time to the factitious M. de Naquet; now he was to be entrusted with the final negotiations which, though at a heavy cost, would bring security and happiness once more in the sumptuous palace of the Rue de Grammont. - "Castles in the Air", Baroness Emmuska Orczy.
• America was, therefore, called upon to take steps to prevent the Germans getting supplies from this country, through the intermediary of Holland and the Scandinavian countries. - "Kelly Miller's History of the World War for Human Rights", Kelly Miller.