mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər 

1

: one that mediates

especially : one that mediates between parties at variance

2

: a mediating agent in a physical, chemical, or biological process

Synonyms

• broker
• buffer
• conciliator
• go-between
• honest broker
• interceder
• intercessor
• intermediary
• intermediate
• interposer
• middleman
• peacemaker

Examples of mediator in a Sentence

if you two cannot resolve this argument on your own, we'll have to bring in a mediator

Recent Examples on the Web

Speaking to Iranian state television from Algeria, Abbas Araghchi maintained the talks would be indirect, likely with Omani mediators shuttling between the parties. —Jon Gambrell and Amir Vahdat, Los Angeles Times, 8 Apr. 2025

In diplomatic terms, that means mediators pass messages between the sides. —Barak Ravid, Axios, 7 Apr. 2025

The release of histamine, and other chemical mediators released by the mast cell, can lead to inflammation in the body, Bassett said. —John W. Dean, MSNBC Newsweek, 6 Apr. 2025

African Union mediators arrived in South Sudan's capital Juba this week for talks aimed at averting a new civil war in the country after its First Vice President Riek Machar was placed under house arrest last week. —Joey Garrison, USA Today, 6 Apr. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mediator

• activator
• actuator
• agitator
• alligator
• allocator
• alternator
• animator
• annotator
• applicator
• arbitrator
• aspirator
• aviator

Kids Definition

mediator

noun

me·​di·​a·​tor ˈmēd-ē-ˌāt-ər 

: one that mediates

mediatory

-ē-ə-ˌtōr-ē

-ˌtȯr-

adjective

Medical Definition

mediator

noun

me·​di·​a·​tor ˈmēd-ē-ˌāt-ər 

: one that mediates

especially : a mediating agent (as an enzyme or hormone) in a chemical or biological process

substance P, a neuropeptide mediator of analgesic stimuli in peripheral sensory nerves

—D. R. Robinson

Legal Definition

mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər 

: one that works to effect reconciliation, settlement, or compromise between parties at variance compare arbitrator