moderator

noun

mod·​er·​a·​tor ˈmä-də-ˌrā-tər How to pronounce moderator (audio)
plural moderators
1
: someone who presides over an assembly, meeting, or discussion: such as
a
: the chairman of a discussion group
b
: a person who administers an online forum, chat room, or group
c
: the nonpartisan presiding officer of a town meeting
d
: the presiding officer of a Presbyterian governing body
2
: one who arbitrates : mediator
3
: a substance (such as graphite) used for slowing neutrons in a nuclear reactor
moderatorship noun

Examples of moderator in a Sentence

The moderator allowed audience members to ask the governor questions. She acts as the moderator in our office meetings.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Questions filtered through moderator Questions for the judges had to be written on a card and were then read by a moderator. Kevin Grasha, The Enquirer, 2 July 2025 Film and creative director Alexandra Thurmond will serve as moderator. Karoline Leonard, Austin American Statesman, 2 July 2025 And with that, please welcome your moderator, writer, producer, host of the outside podcast, and probably the only man dumb enough to wrangle this crew. Outside Online, 18 June 2025 On Friday, Gaines spouted off at a children’s softball team on X, mocking the team’s moderators for turning off the post comments. Caroline Price, Forbes.com, 7 June 2025 See All Example Sentences for moderator

Word History

First Known Use

circa 1560, in the meaning defined at sense 2

Time Traveler
The first known use of moderator was circa 1560

Browse Nearby Words

Cite this Entry

“Moderator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/moderator. Accessed 12 Jul. 2025.

Kids Definition

moderator

noun
mod·​er·​a·​tor ˈmäd-ə-ˌrāt-ər How to pronounce moderator (audio)
1
: one that moderates: as
a
: the leader of a Presbyterian governing body
b
: the chairperson of a town meeting
c
: the chairperson of a discussion group (as on television)
2
: a substance (as graphite) used for slowing down neutrons in a nuclear reactor

Medical Definition

moderator

noun
mod·​er·​a·​tor ˈmäd-ə-ˌrāt-ər How to pronounce moderator (audio)
: a substance (as graphite, deuterium in heavy water, or beryllium) used for slowing down neutrons in a nuclear reactor

More from Merriam-Webster on moderator

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!