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.
During the 2012-13 NHL lockout, the two sides used FMCS, and recommendations by mediator Scot Beckenbaugh were thought to help the NHL and NHLPA find a solution. Michael McCann, Sportico.com, 2 July 2026 Kushner has joined fellow peace envoy Steve Witkoff in Doha, Qatar, a country acting as mediator between the two sides, to hammer out a resolution. Madeleine Marr, Miami Herald, 1 July 2026 Instead, the mediators will convey points from either side to the other, with the goal being to ease tension following another exchange of fire that erupted at the end of last week. July 1, CBS News, 1 July 2026 Qatar has been a key mediator between Iran and the United States. Willem Marx, NPR, 28 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 5 Jul. 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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