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

Tehran is expected to hand over its reply to mediators about the US proposal on Thursday, a regional source previously told CNN. —Jennifer Hansler, CNN Money, 7 May 2026

Iranian Foreign Ministry spokesperson Esmaeil Baqaei told news outlets Wednesday that Tehran is still reviewing the proposal and would present its response to mediators in Pakistan. —Chloe Taylor,kevin Breuninger, CNBC, 6 May 2026

The Vatican has also traditionally acted as a mediator with Cuba, a country Trump has mused about taking over. —Kim Hjelmgaard, USA Today, 4 May 2026

The Islamic Republic’s latest proposal, the details of which have not been made known, was passed to the White House via Pakistani mediators on Thursday evening. —Timothy Nerozzi, The Washington Examiner, 1 May 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mediator

• coater
• creator
• curator
• debater
• deflator
• dictator
• dilator
• equator
• locator
• mutator
• piscator
• pronator

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