mediator

One that mediates, especially one that reconciles differences between disputants.

A substance or structure that mediates a specific response in a bodily tissue.

A subatomic particle that effects or conveys a force between subatomic particles.

One who mediates; one who interposes between parties; especially, one who interposes for the purpose of effecting reconciliation.

A go-between; an agent.

Synonyms Intercessor, interceder, propitiator.

One who mediates; especially, one who interposes between parties at variance for the purpose of reconciling them; hence, an intercessor.

One who negotiates between parties seeking mutual agreement

a negotiator who acts as a link between parties