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

But Beijing has since attempted to revive stalled or canceled bilateral projects while supporting reconciliation efforts and positioning itself as a neutral mediator. —Tharaphi Than, The Conversation, 28 Mar. 2025

And that then triggers these cells, called the mast cells, to release all these inflammatory mediators, like histamine and other kinds of mediators, like nutrients, which can have kind of profound effects. —Ron Estes, MSNBC Newsweek, 28 Mar. 2025

According to court papers, the case took a long time as the parties produced extensive evidence, including more than 910,000 pages of documents and multiple terabytes of click data from Google, and participated in six mediation sessions before four different mediators. —Jonathan Stempel, USA Today, 28 Mar. 2025

In his nightly address, Zelensky accused Moscow of trying to deceive mediators by adding new terms. —Ivana Kottasová, CNN, 25 Mar. 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