C1 noun /ˌɪntərˈmiːdiˌɛri/
intermediary
посредник
Meaning
A person who acts as a link between people in order to try to bring about an agreement; a mediator.
Example
The diplomat served as an intermediary between the two conflicting nations.
Дипломат выполнял роль посредника между двумя конфликтующими нациями.