mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər How to pronounce mediator (audio)
Synonyms of mediator
1
: one that mediates
especially : one that mediates between disputing parties
2
: a mediating agent in a physical, chemical, or biological process

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Pakistan has emerged as a key mediator in bringing Iran and the United States to the negotiating table in efforts to resolve the ongoing war. ABC News, 12 June 2026 Pakistan has served as one of the primary mediators for the slow-moving negotiations between Tehran and Washington. Callum Sutherland, Time, 10 June 2026 Pakistan’s Field Marshal Asim Munir, a key mediator to those talks, met Friday with the commander-in-chief of Lebanon’s beleaguered armed forces, which would be charged with disarming Hezbollah and ensuring its forces do not return to southern Lebanon. Jeremy Diamond, CNN Money, 9 June 2026 Now, by a vote of 230 to 193, the House has approved a bill that would force employers to the table, allow federal mediators to get involved if a deal is not reached within 90 days, and — if needed — settle the matter through arbitration shortly thereafter. Andrea Hsu, NPR, 9 June 2026 See All Example Sentences for mediator

Word History

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of mediator was in the 14th century

Browse Nearby Words

Cite this Entry

“Mediator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mediator. Accessed 17 Jun. 2026.

Kids Definition

mediator

noun
me·​di·​a·​tor ˈmēd-ē-ˌāt-ər How to pronounce mediator (audio)
: one that mediates
mediatory
-ē-ə-ˌtōr-ē
-ˌtȯr-
adjective

Medical Definition

mediator

noun
me·​di·​a·​tor ˈmēd-ē-ˌāt-ər How to pronounce mediator (audio)
: 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 How to pronounce mediator (audio)
: one that works to effect reconciliation, settlement, or compromise between parties at variance compare arbitrator

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