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

Example Sentences

if you two cannot resolve this argument on your own, we'll have to bring in a mediator
Recent Examples on the Web Washington attorney Kenneth Feinberg, a renowned mediator known for overseeing the compensation fund for 9/11 victims, was tapped to lead the negotiations. Holly Bailey, Washington Post, 6 Jan. 2023 The United States and the European Union, which had once played a balancing role in the South Caucasus, effectively pulled back from active diplomacy and let Russia act as the sole mediator. Lara Setrakian, CNN, 5 Jan. 2023 Both sides will meet to hammer out details about the mediation process, and must agree on a mediator and a timeline. Los Angeles Times, 9 Dec. 2022 Encouraged by a mediator, the school board gave in to student demands. Dallas News, 1 Dec. 2022 Last week, both sides agreed to bring in an independent mediator, Darrell Steinberg, the mayor of Sacramento and former leader of the state senate. Douglas Belkin, WSJ, 17 Dec. 2022 Britt Reid’s criminal case was first heard by a mediator, a common approach to settling civil suits such as divorces but one that is rarely used in criminal cases, according to a spokesman for the Jackson County court system. Joe Drape, New York Times, 1 Nov. 2022 The Akron Municipal Court will use $425,000 in grant money to hire a mediator, a project manager and a technical analyst. cleveland, 24 Oct. 2022 But word from Washington, so often the mediator in the broader Israeli-Palestinian conflict, will be seen as significant. Alexander Smith, NBC News, 4 July 2022 See More

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.

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

Dictionary Entries Near mediator

Cite this Entry

“Mediator.” Dictionary, Merriam-Webster, Accessed 5 Feb. 2023.

Kids Definition


me·​di·​a·​tor ˈmēd-ē-ˌāt-ər How to pronounce mediator (audio)
: one that mediates

Medical Definition


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


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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