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

Some of the protest leaders say they felt pressured by international mediators, in particular the Americans, to accept it, despite their misgivings. The Economist, "The Sudan peace deal is greeted with little excitement," 8 July 2019 The union and authority are negotiating with help from a federal mediator. Kellen Browning,, "Though strike continues, Martha’s Vineyard buses running close to normal on Fourth of July," 4 July 2019 Of the settlement funds, $25.5 million will go to recouping government losses, with another $7 million designated as interest on that amount, according to a statement Friday from a mediator who worked on the case, Judge Gerald Rosen. Clare Duffy, CNN, "Quicken Loans settles with Federal Housing Authority in fraudulent lending case," 14 June 2019 Japan maintains friendly ties with both Tehran and Washington and hopes to serve as mediator, a task experts say is difficult. Fox News, "Japan's Abe heads to Iran in hopes to help ease tension," 12 June 2019 The deal called for Mr. Wigdor, along with a mediator, to provide a breakdown of how the money will be distributed to each plaintiff. Emily Steel, New York Times, "Fox Settles Discrimination Lawsuits for Roughly $10 Million," 15 May 2018 When addressing a conflict involving a multitude of perspectives, mediators look for overarching interests and values. Steven P. Dinkin, San Diego Union-Tribune, "Homelessness: Many sides of the same coin," 23 June 2019 If this doesn’t work, employees occasionally escalate by going to the boss’ boss, or by involving an attorney or union steward or other mediator. Amy Lindgren, Twin Cities, "Working Strategies: Bad bosses part 2 — getting out of hot water," 22 June 2019 As Maupin tried to serve as a neutral mediator and allow the students to read statements of apologies, he was met with jeers from some students, who called him a shill for racists. Richard Ruelas And, azcentral, "Why has former Attorney General Tom Horne aligned himself with the Rev. Jarrett Maupin?," 21 June 2019

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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Statistics for mediator

Last Updated

11 Jul 2019

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Time Traveler for mediator

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

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More Definitions for mediator


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

Comments on mediator

What made you want to look up mediator? Please tell us where you read or heard it (including the quote, if possible).


to form ideas or theories about something

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