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

• negotiator
• conciliator
• intermediary
• peacemaker
• broker
• ambassador
• intercessor
• liaison
• middleman
• buffer
• attorney

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

The pace of the talks between the UFCW and chains was briefly disrupted in late March when the federal mediator assigned to their negotiations was fired by the Trump administration. —Pat Maio, Oc Register, 7 Aug. 2025

That’s good news for fans who just wanted to watch hockey without hearing from the accountants and mediators. —Sean McIndoe, New York Times, 25 July 2025

Successive rounds of ceasefire talks have been held in the Qatari capital of Doha, with the U.S. serving as a mediator. —Tom O'Connor, MSNBC Newsweek, 24 July 2025

The first round of indirect talks ended without any progress on Sunday night, but it is understood that Qatari and Egyptian mediators will regroup to try again. —Callum Sutherland, Time, 7 July 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