intermediary UK /ˌɪntə(ɹ)ˈmiːdi.əɹi/US /ˌɪn(t)ɚˈmidiˌɛɹi/noun 3adjective 1forms 1 noun3 •An agent acting as a mediator between sides to facilitate agreement or cooperation.A Mr. Whymper, a solicitor living in Willingdon, had agreed to act as intermediary between Animal Farm and the outside world […] — 1943 •A person or organisation in an intermediate position (in a transaction, agreement, supply chain, etc.)The intermediary between the manufacturer and retailer is the wholesaler •One or several stages of an event which occurs after the start and before the end. adjective1 •That intermediates. formsintermediaries