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

Many in the Palestinian diaspora live across the border in Egypt, which was a key mediator of the Israel-Hamas ceasefire. — Wafaa Shurafa, Los Angeles Times, 8 July 2026

Some are journalists, mediators, plumbers, custodians, and writers. — Chris John Amorosino, Hartford Courant, 5 July 2026

Hamas appealed to mediators and the international community to push for Israel to allow the committee to enter Gaza. — Oren Liebermann, CNN Money, 6 July 2026

Kushner has joined fellow peace envoy Steve Witkoff in Doha, Qatar, a country acting as mediator between the two sides, to hammer out a resolution. — Madeleine Marr, Miami Herald, 1 July 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