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

Pakistan has emerged as a key mediator between the US and Iran in recent months during the war in the Middle East, playing a leading role in negotiating a temporary ceasefire in April. —Alayna Treene, CNN Money, 30 May 2026

The other candidates’ blackout is compounded by the eagerness of debate mediators to interrogate the candidates on other issues while failing to bring up education. —Dan Walters, Mercury News, 27 May 2026

Baltimore's Mayor's Office said the Penn North community, backed by the Mayor's Office of Neighborhood Safety and Engagement (MONSE), Safe Streets, and Catholic Charities, achieved the milestone with more than 100 mediators, 45 community events, and anti-violence messaging. —Adam Thompson, CBS News, 26 May 2026

The other candidates’ blackout is compounded by the eagerness of debate mediators to interrogate the candidates on other issues while failing to bring up education. —Dan Walters, Oc Register, 26 May 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