in ‧ ter ‧ me ‧ di ‧ a ‧ ry /ˌɪntəˈmiːdiəri $ ˌɪntərˈmiːdieri/ BrE AmE noun ( plural intermediaries ) [countable]
a person or organization that tries to help two other people or groups to agree with each other ⇨ go-between :
Jackson acted as an intermediary between the two parties.
—intermediary adjective [only before noun] :
an intermediary role in the talks