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

Oman, a historic US ally, has attempted to act as a mediator between the US and Iran both before and during the conflict, notably hosting nuclear negotiations between Tehran and Washington before the war broke out in February. — Billy Stockwell, CNN Money, 19 Aug. 2026

Oman has played a relatively low-profile role since the Iran war began, including as a mediator. — ABC News, 18 Aug. 2026

Reuters reported that Rezaei said Washington would have to end the war and unfreeze Iranian funds overseas, with other conditions relayed through mediators. — Efrat Lachter, FOXNews.com, 18 Aug. 2026

The faith is based in the worship of orishas, which can be described as saints or mediators of humanity’s relationship with the sacred, with similar roles to saints in the Catholic religion. — Delia Sauer, Miami Herald, 15 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