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

Officials are considering involving mediators from the Israel‑Hamas talks, with Qatar and Turkey expected to play behind‑the‑scenes roles. —Matthew Robinson, MSNBC Newsweek, 21 Nov. 2025

Scores of Hamas militants, split up into independent cells, are trapped in tunnels underground behind Israeli lines, as mediators try to find a solution that doesn’t collapse the month-old ceasefire in Gaza. —Eugenia Yosef, CNN Money, 15 Nov. 2025

If there is a dispute about physical custody, the two will turn to a mediator to solve the issue. —Hannah Sacks, PEOPLE, 14 Nov. 2025

As a mediator, riboflavin cycles electrons from the battery’s electrodes and the glucose electrolyte, creating an electrochemical flow from the sugar’s energy. —New Atlas, 14 Nov. 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