mediator
US /ˈmiː.di.eɪ.t̬ɚ/
UK /ˈmiː.di.eɪ.t̬ɚ/

1.
médiateur, conciliateur
a person who attempts to make people involved in a conflict come to an agreement; a go-between.
:
•
The union and management agreed to use a mediator to resolve their dispute.
Le syndicat et la direction ont convenu de faire appel à un médiateur pour résoudre leur différend.
•
She acted as a mediator between the two warring factions.
Elle a agi comme médiatrice entre les deux factions en guerre.