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

Advertisement After consultations with Israeli officials, Qatari negotiators, and regional mediators, Witkoff and Kushner assembled a 20-point peace plan calling for a ceasefire and hostage exchange, Israeli security guarantees, the demilitarization of Gaza, and a new civilian governing authority. —Eric Cortellessa, Time, 11 Oct. 2025

Here and in many of her writings Stowe imagined Christ as a mediator capable of elevating all Christians to heaven. —Literary Hub, 10 Oct. 2025

Still, a mediator has been called in for Actors’ Equity and the League, and talks continue Thursday. —Caitlin Huston, HollywoodReporter, 9 Oct. 2025

Leaders from Israel, Hamas and mediator Qatar subsequently confirmed the deal. —James Powel, USA Today, 9 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