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

Gandbhir, whose family was close to Owens, wonders why the police didn’t bring in a social worker or other type of mediator to diffuse the situation. —Olivia B. Waxman, Time, 17 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

The deal calls for the creation of a joint task force, including the United States and other mediators, to share information about the remains and try to find them. —Brady Knox, The Washington Examiner, 16 Oct. 2025

Gal Hirsch, Israel’s coordinator for the return of hostages and missing persons, sought to reassure families in a note seen by AP reporters, saying that international mediators were applying pressure on Hamas to accelerate the process. —Barney Henderson, MSNBC Newsweek, 14 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