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

In this context, the movement affirms its readiness to immediately enter into negotiations through the mediators to discuss the details of this agreement. —Jesus Mesa, MSNBC Newsweek, 3 Oct. 2025

Egypt, Qatar, and Turkey — the main mediators with Hamas — are pressing the Islamist group to agree to a deal that would free Israeli hostages, end the conflict, and ultimately disarm and dismantle the organization. —Mohammed Sergie, semafor.com, 1 Oct. 2025

Key mediators Qatar and Egypt are set to hold meetings with Hamas in Doha on Tuesday evening to discuss the proposal. —Oren Liebermann, CNN Money, 30 Sep. 2025

Hamas did not immediately respond to comments from the president or the prime minister, but an official familiar with the negotiations said mediators had not yet fully briefed the group on the latest peace plan. —Shannon K. Kingston, ABC News, 29 Sep. 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