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

Paramount has no knowledge of any promises or commitments made to President Trump other than those set forth in the settlement proposed by the mediator and accepted by the parties. —Todd Spangler, Variety, 4 July 2025

The mediators and the U.S. would provide assurances about talks to end the war, but Israel isn't committing to that as part of the latest proposal, the official said. —arkansasonline.com, 3 July 2025

Union officials and company negotiators are meeting in the presence of a federal mediator, but apparently have not found middle ground since about 450 workers walked off the job on Tuesday. —Matthew Medsger, Boston Herald, 3 July 2025

The mediators and the U.S. would provide assurances about talks to end the war, but Israel is not committing to that as part of the latest proposal, the official said. —Anders Hagstrom, FOXNews.com, 2 July 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