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

• broker
• buffer
• conciliator
• go-between
• honest broker
• interceder
• intercessor
• intermediary
• intermediate
• interposer
• middleman
• peacemaker

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

The student played a leading role in last year’s campus protests about the rising death toll in Gaza in Israel’s war against Hamas and the university’s investment ties to Israel, acting as a mediator between Columbia administrators and student protesters. —Molly Crane-Newman, New York Daily News, 24 Apr. 2025

Hermosillo works out of the agency’s Los Angeles office in Glendale, staffed by five mediators and a supervisor. —Los Angeles Times, Chicago Tribune, 22 Apr. 2025

Berri served as the mediator between Hezbollah and the US in talks last year to reach a ceasefire with Israel. —Nadeen Ebrahim, CNN Money, 16 Apr. 2025

Earlier Tuesday, officials involved in mediating Gaza ceasefire talks had expressed optimism that a deal could be reached within weeks, Egyptian mediators told NPR. —Aya Batrawy, NPR, 15 Apr. 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