me·​di·​a·​tor | \ ˈmē-dē-ˌā-tər How to pronounce mediator (audio) \

Definition of mediator

1 : one that mediates especially : one that mediates between parties at variance
2 : a mediating agent in a physical, chemical, or biological process

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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

Also at the ceremony were U.N. Under-Secretary for Political Affairs Rosemary di Carlo, the U.N. mediator for the name dispute, Matthew Nimetz, EU Foreign Affairs chief Federica Mogherini and EU Enlargement Commissioner Johannes Hahn. Washington Post, "Greece, Macedonia sign deal ending yearslong name dispute," 18 June 2018 Palestine Liberation Organization Secretary General Saeb Erekat said Trump’s comments at Davos reinforce the idea that the U.S. can’t be a peace mediator. Shannon Pettypiece,, "Trump Says He'll Cut Off Palestinian Money Without Talks," 25 Jan. 2018 Another Target Area mediator, Michael Nash, who speaks regularly with the Mac and LoweLife factions, said Reese and Gates were once friends. Washington Post, "Gangs embrace social media with often deadly results," 13 June 2018 Those born under this lunation are natural mediators, and Libra moons are happiest when keeping the peace. Aliza Kelly Faragher, Allure, "What Your Moon Sign Reveals About Your Emotional Personality," 23 Apr. 2018 The coalition promised payments to al-Qaida members who left, according to Shabwa's security chief Awad al-Dahboul, a mediator and two government officials. Maggie Michael, Fox News, "Yemen: US allies strike deals with al-Qaida in war on rebels," 6 Aug. 2018 Working to settle the protracted conflict in Syria, where Russia is aiding President Bashar al-Assad but has also tried to reinforce its role as mediator between the warring sides, appeared to be a bright spot during Mr. Bolton’s talks in Moscow. Anatoly Kurmanaev, WSJ, "Bolton Says Trump Would Welcome Meeting with Putin Next Month in Paris," 23 Oct. 2018 On the last day, the remaining fighters were thrown a farewell dinner at the farm of one of the mediators. Maggie Michael, Fox News, "Details of deals between US-backed coalition, Yemen al-Qaida," 6 Aug. 2018 Another avenue is hiring a more affordable, by-the-hour mediator like Miraglia, who mediates a conversation and drafts a contract based on a couple’s goals. Hannah Hickok, Glamour, "I Got a Prenup—but It Wasn't to Protect My Money," 27 Nov. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mediator.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of mediator

14th century, in the meaning defined at sense 1

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Last Updated

30 May 2019

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

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me·​di·​a·​tor | \ ˈmēd-ē-ˌāt-ər How to pronounce mediator (audio) \

Medical Definition of mediator

: 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


me·​di·​a·​tor | \ ˈmē-dē-ˌā-tər How to pronounce mediator (audio) \

Legal Definition of mediator

: one that works to effect reconciliation, settlement, or compromise between parties at variance — compare arbitrator

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More from Merriam-Webster on mediator

Rhyming Dictionary: Words that rhyme with mediator

Thesaurus: All synonyms and antonyms for mediator

Spanish Central: Translation of mediator

Nglish: Translation of mediator for Spanish Speakers

Britannica English: Translation of mediator for Arabic Speakers

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showing courage and determination

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