mediator

noun

me·​di·​a·​tor ˈmē-dē-ˌā-tər 

1

: one that mediates

especially : one that mediates between disputing parties

2

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

Synonyms of mediator

• 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

Oman, which lies across the Strait of Hormuz from Iran, has at times played a mediator role in the region. — Samy Magdy, Los Angeles Times, 10 Oct. 2026

Oman, which lies across the Strait of Hormuz from Iran, has played a mediator role at times in the region. — Samy Magdy, Fortune, 10 Oct. 2026

The system brings together the electrodes, a redox mediator, the solvent environment, and the operating configuration. — Kaif Shaikh, Interesting Engineering, 9 Oct. 2026

The mediator does an intense workout taking the offers and counteroffers between the parties, up and down an elegant staircase that separates the teams. — Rafaela Bassili, Vulture, 9 Oct. 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mediator

• creator
• curator
• debater
• deflator
• dictator
• dilator
• equator
• locator
• piscator
• pronator
• relator
• rotator

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