mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər How to pronounce mediator (audio)
1
: one that mediates
especially : one that mediates between parties at variance
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.
Khalil worked as a mediator between protesters and Columbia University during protests on the campus in 2023 and 2024. Dan Gooding gabe Whisnant, MSNBC Newsweek, 11 June 2025 Since Trump took office, Oman, Qatar, Saudi Arabia, and the UAE have all counseled against war and acted as intermediaries and mediators between Tehran and Washington. Vali Nasr, Foreign Affairs, 10 June 2025 The suit — an obstacle to CBS parent Paramount Global’s deal to merge with Skydance Media — has gone to a mediator. Stephen Battaglio, Los Angeles Times, 10 June 2025 Egypt has acted as a central mediator alongside the United States and Qatar in the conflict between Israel and Hamas, helping to establish a ceasefire and secure the release of prisoners and hostages. Francesca Chambers, USA Today, 6 June 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 17 Jun. 2025.

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
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!