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.
The moderator accused me of being pro-Nazi, banned me permanently for life, and deleted all my past posts from the 'comics' subreddit. Dan Perry, Newsweek, 31 Jan. 2025 The moderators noted that while many F1 journalists have migrated to alternative platforms like Bluesky, teams and drivers have yet to make the transition. Esat Dedezade, Forbes, 22 Jan. 2025 Reddit users will recall that when moderators were recently viewed by Reddit as breaking Reddit rules at scale (by making subreddits read-only or private in protest of Reddit’s new API access rules and pricing), Reddit responded by removing moderators that refused to re-open protesting subreddits. Ars Technica, 22 Jan. 2025 The View cohosts – sans moderator Whoopi Goldberg who was out for a previous work commitment – dove right into the new Trump era, dissecting yesterday’s Inauguration and pondering what the next four years will look like. Greg Evans, Deadline, 21 Jan. 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

Dictionary Entries Near moderator

Cite this Entry

“Moderator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/moderator. Accessed 6 Feb. 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!