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mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər How to pronounce mediator (audio)
Synonyms of mediatornext
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.
Upon learning of King’s death, CRS mediators addressed the crowd that gathered encouraged them to go home and refrain from protesting or committing acts of violence, a DOJ report said. Josh Meyer, USA Today, 10 Jan. 2026 The increasing perils faced by mediators, coupled with the complexity of contemporary conflicts, demand that states and multilateral institutions must pool their experience, capacity and resources more effectively. Galip Dalay, Time, 6 Jan. 2026 Despite his mediator role, Rodríguez is also known for his explosive temperament, lashing out in Congress and publicly threatening and insulting members of the opposition. Bloomberg Wire, Dallas Morning News, 4 Jan. 2026 Israeli officials have been taking a lot of time to vet and approve members of the Palestinian technocratic committee from a list given to them by the mediators, and Israel continues its military strikes. Arkansas Online, 30 Dec. 2025 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 13 Jan. 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

More from Merriam-Webster on mediator

Last Updated: - Updated example sentences
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