mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər 

1

: one that mediates

especially : one that mediates between parties at variance

2

: a mediating agent in a physical, chemical, or biological process

Synonyms

• broker
• buffer
• conciliator
• go-between
• honest broker
• interceder
• intercessor
• intermediary
• intermediate
• interposer
• middleman
• peacemaker

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

While disputes are enforced on-chain, and a DAO system transparently manages worker proposals, the arbiter functions similarly to an independent mediator in any traditional legal process. —Saro McKenna, Forbes.com, 20 June 2025

Mediation and Gaming Sessions at the Museum Museum visitors at the Louvre are invited to test the scenario of the Battle of Ain Jalut, specially designed for the Mamluk exhibition, in the presence of a Louvre mediator and an Xbox representative during an exceptional series of workshops. —Jennifer Maas, Variety, 13 June 2025

Conferences are asking member schools to agree in writing to comply and adhere to CSC enforcement decisions, which will include the use of outside mediators. —Evan Drellich, New York Times, 7 June 2025

Some five years on, the way the talks floundered and then failed can offer lessons about the challenges today’s would-be mediators now face. —Anna Batta, The Conversation, 2 June 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mediator

• activator
• actuator
• agitator
• alligator
• allocator
• alternator
• animator
• annotator
• applicator
• arbitrator
• aspirator
• aviator

Kids Definition

mediator

noun

me·​di·​a·​tor ˈmēd-ē-ˌāt-ər 

: one that mediates

mediatory

-ē-ə-ˌtōr-ē

-ˌtȯr-

adjective

Medical Definition

mediator

noun

me·​di·​a·​tor ˈmēd-ē-ˌāt-ər 

: 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 

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