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

Ali Al-Thawadi Al-Thawadi is a diplomat from Qatar, which has been a key mediator between Israel and Hamas throughout the war. —Sam Mednick, Los Angeles Times, 19 Jan. 2026

Consensio research into conflict at work found that employees trained as workplace mediators often become advocates for healthier ways of working, helping to shift organizational culture. —Anna Shields, Forbes.com, 19 Jan. 2026

Committee members also include a diplomat from Qatar, an intelligence chief from Egypt and Turkey’s foreign minister — all countries have been ceasefire mediators — as well as a Cabinet minister for the United Arab Emirates. —Natalie Melzer, Chicago Tribune, 17 Jan. 2026

By pressing on with the second phase of the ceasefire, Washington and its mediator partners will need to tackle the vexing challenges of disarming Hamas, further Israeli withdrawal tied to the disarmament and deploying an international peacekeeping force. —Reuters, NBC news, 16 Jan. 2026

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