mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər 

1

: one that mediates

especially : one that mediates between parties at variance

2

: a mediating agent in a physical, chemical, or biological process

Synonyms

• 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

Experts say the outlandish idea galvanized Arab negotiators and regional mediators to expedite a peace process. —Eric Cortellessa, Time, 23 Oct. 2025

The film presents a fresh perspective on the history of American and Japanese relations, exploring how sports serve as a cultural mediator, and examining the bond that baseball forged between the two countries. —Addie Morfoot, Variety, 22 Oct. 2025

Unlike previous courtroom appearances, in which Bell presided as judge, the 67-year-old former federal prosecutor will serve as mediator. —Michael McCann, Sportico.com, 20 Oct. 2025

The researchers, led by Jong-Hwa Shon, designed a prototype that uses riboflavin as an electron mediator. —Aamir Khollam, Interesting Engineering, 16 Oct. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mediator

• activator
• actuator
• agitator
• alligator
• allocator
• alternator
• animator
• annotator
• applicator
• arbitrator
• aspirator
• aviator

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