mediatorPronunciation: /ˈmiːdɪeɪtə/Translate mediator | into French | into German | into Italian | into Spanish Definition of mediator noun a person who attempts to make people involved in a conflict come to an agreement; a go-between: the government appointed a mediator to assist in finding a resolution to the disputeDerivatives mediatoryPronunciation: /ˈmiːdɪət(ə)ri/ adjective mediator in other Oxford dictionaries Definition of mediator in the US English dictionary