arbitrator; mediator; go-between
Refers to a person who intervenes in a dispute to help the parties reach an agreement, often in a formal or official capacity.
He is trusted as a mediator between labor and management.
国際紛争では、中立の調停者が不可欠だ。
In international disputes, a neutral arbitrator is essential.
仲介者 is a broader intermediary or go-between, not necessarily in a dispute context; 調停者 implies active conflict resolution.
Compound of 調停 (mediation, arbitration) and 者 (person). The word is transparently derived from its components.