mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər 

1

: one that mediates

especially : one that mediates between disputing parties

2

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

Synonyms of mediator

• negotiator
• conciliator
• intermediary
• peacemaker
• broker
• ambassador
• intercessor
• liaison
• middleman
• buffer
• attorney

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

In Cairo, there are meetings planned with Egyptian officials and other mediators. — Frank Andrews, CBS News, 14 Aug. 2026

Tracy Moore-Grant, a divorce attorney, mediator and founder of the Amicable Divorce Network, has seen the shift. — Helen Carefoot, Flow Space, 13 Aug. 2026

Successful processes have featured a lead mediator working alongside supporting states or organizations. — Matt Waldman, Foreign Affairs, 13 Aug. 2026

Hamas remains committed to a Gaza roadmap agreed with mediators and representatives of the Board of Peace in Cairo 10 days ago, senior Hamas official Basem Naim told Reuters. — Eric MacK, FOXNews.com, 9 Aug. 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mediator

• creator
• curator
• debater
• deflator
• dictator
• dilator
• equator
• locator
• piscator
• pronator
• relator
• rotator

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