me ‧ di ‧ a ‧ tor /ˈmiːdieɪtə $ -ər/ BrE AmE noun [countable]
[ Word Family: noun : ↑ mediation , ↑ mediator ; verb : ↑ mediate ]
a person or organization that tries to end a quarrel between two people, groups, countries etc by discussion ⇨ intermediary