mod·​er·​a·​tor | \ ˈmä-də-ˌrā-tər How to pronounce moderator (audio) \

Definition of moderator

1 : one who arbitrates : mediator
2 : one who presides over an assembly, meeting, or discussion: such as
a : the presiding officer of a Presbyterian governing body
b : the nonpartisan presiding officer of a town meeting
c : the chairman of a discussion group
3 : a substance (such as graphite) used for slowing neutrons in a nuclear reactor

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Other Words from moderator

moderatorship \ ˈmä-​də-​ˌrā-​tər-​ˌship How to pronounce moderatorship (audio) \ 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

However, as the report itself notes, that could worsen conditions for the company’s already traumatized moderators. Louise Matsakis, WIRED, "Facebook’s New Content Moderation Tools Put Posts in Context," 3 July 2019 The subject was my recent pieces on Facebook content moderators. Casey Newton, The Verge, "A Facebook civil rights audit could have unintended consequences," 2 July 2019 To be more effective, the company will dedicate some content moderators on hate speech alone. Irina Ivanova, CBS News, "Facebook details efforts to prepare for 2020 elections, Census disinformation," 1 July 2019 In response, Biden wilted, ending the exchange by practically begging the moderators to intercede. Alex Shephard, The New Republic, "What Kamala Harris Didn’t Say," 1 July 2019 The same evening Booker also answered a moderator’s question partially in Spanish. Rebecca Morin, USA TODAY, "Some 2020 Democrats spoke in Spanish during their first debate. Was it 'Hispandering'?," 30 June 2019 The 10 Democratic hopefuls spent much of the evening pointing fingers, shouting over each other and ignoring the harried moderators who tried, usually unsuccessfully, to enforce the one-minute time limit for responses. John Wildermuth,, "Kamala Harris takes command during heated presidential debate," 28 June 2019 The big platforms and their contractors routinely require moderators to sign non-disclosure agreements. The Economist, "The unacknowledged legislators of the online world," 14 June 2019 The networks announced on Tuesday morning that the moderators will be Lester Holt, Savannah Guthrie, Chuck Todd, Rachel Maddow and José Díaz-Balart. Madeleine Joung, Time, "Here's Which Candidates Have Already Qualified for the Democratic Presidential Debate," 12 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'moderator.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of moderator

circa 1560, in the meaning defined at sense 1

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Statistics for moderator

Last Updated

8 Jul 2019

Look-up Popularity

Time Traveler for moderator

The first known use of moderator was circa 1560

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More Definitions for moderator



English Language Learners Definition of moderator

: someone who leads a discussion in a group and tells each person when to speak : someone who moderates a meeting or discussion


mod·​er·​a·​tor | \ ˈmäd-ə-ˌrāt-ər How to pronounce moderator (audio) \

Medical Definition of moderator

: a substance (as graphite, deuterium in heavy water, or beryllium) used for slowing down neutrons in a nuclear reactor

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Comments on moderator

What made you want to look up moderator? Please tell us where you read or heard it (including the quote, if possible).


an act or instance of editing or removing

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