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 asked for guarantees that hostilities in Lebanon would end, as outlined in the deal signed with Washington, and mediators were working to resolve the issue, the diplomat said. —Yuliya Talmazan, NBC news, 19 June 2026

What To Watch For Both Rubio and Vance have played major roles in the Iran war, with Vance serving as the chief negotiator with mediators and Rubio among the key decision-making team. —Sara Dorn, Forbes.com, 19 June 2026

On Friday, Iranian Foreign Ministry spokesperson Esmaeil Baghaei said consultations through mediators were ongoing regarding the next phase of negotiations to draft a final agreement. —Erin Cunningham, Los Angeles Times, 19 June 2026

In Tehran, Qatari mediators brokering an end to the US-Iran war paused their discussions to watch a match, the Financial Times reported. —Manal Albarakati, semafor.com, 18 June 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