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

In an effort to keep negotiations from collapsing, Mr. Witkoff and Oman, which is acting as a mediator, are discussing creative options. —Julian E. Barnes, New York Times, 28 May 2025

The announcement comes as Iran and the U.S. prepare for a fifth round of talks in Rome, with Oman once again serving as mediator. —Amir Daftari, MSNBC Newsweek, 23 May 2025

Oman has long served as a mediator, facilitating quiet diplomacy amid tensions over Iran’s nuclear program and regional security. —Amir Vahdat, Los Angeles Times, 21 May 2025

Destructive conflict styles like withdrawal were found to be particularly damaging, while positive problem-solving and closeness acted as important mediators between mindfulness and relationship health. —Mark Travers, Forbes.com, 20 May 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