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

At the conclusion of mediation, the mediator will propose a solution. —Michael McCann, Sportico.com, 7 Feb. 2025

If mediators the United States, Qatar and Egypt are unable to broker an agreement between Israel and Hamas, the war could resume in early March. —Julia Frankel, Chicago Tribune, 5 Feb. 2025

But negotiations stalled on the seventh day, and contrary to the mediators’ expectations, fighting resumed, and the Israel Defense Forces (IDF) relaunched its massive ground invasion into central Gaza. —Amos Harel, Foreign Affairs, 29 Jan. 2025

The Israelis protested to the Qatari and Egyptian mediators, but didn't stop the implementation of the deal. —Barak Ravid, Axios, 27 Jan. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

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