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

Definition of moderator

1 : one who presides over an assembly, meeting, or discussion: such as
a : the chairman of a discussion group
b : the nonpartisan presiding officer of a town meeting
c : 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

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Other Words from moderator

moderatorship \ ˈmä-​də-​ˌrā-​tər-​ˌship How to pronounce moderator (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 At one point, a moderator needed to step in, and advised journalists to not belabor the point. Alex Coffey, USA TODAY, 2 Sep. 2021 The topic of the day and a question posed by the event's moderator, Courier Journal Executive Editor Mary Irby-Jones: Should Kentucky schools teach critical race theory? Olivia Krauth, The Courier-Journal, 22 July 2021 The link between creativity and empathy, as pointed out by moderator, conference co-chair, and Fortune features editor Kristen Bellstrom, was at the forefront of this session. Adam Erace, Fortune, 24 June 2021 Earlier this year, a UPenn professor gave a Hitler salute after being cut off by a moderator at a virtual conference. Amanda Whiting, Vulture, 20 Aug. 2021 One of his posts was deleted by a moderator on one site, on others his theories were denounced by people questioning his credibility and findings. New York Times, 22 June 2021 One of the questions asked by moderator the Rev. Kalif Crutcher, a chaplain at Advocate Condell Medical Center in Libertyville, was what to tell a person who declines to wear a mask because God will offer protection. Steve Sadin,, 5 Mar. 2021 The format will be the same as the first debate, with six 15-minute segments divided to focus on different issues and questions, chosen by the moderator. Savannah Behrmann, USA TODAY, 22 Oct. 2020 Each cycle is led by a moderator, who notifies users when the time is up and chairs a 10-minute break during which people can interact. Nell Lewis, CNN, 19 Oct. 2020

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 2

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Time Traveler for moderator

Time Traveler

The first known use of moderator was circa 1560

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Last Updated

12 Sep 2021

Cite this Entry

“Moderator.” Dictionary, Merriam-Webster, Accessed 17 Sep. 2021.

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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

More from Merriam-Webster on moderator

Nglish: Translation of moderator for Spanish Speakers

Britannica English: Translation of moderator for Arabic Speakers Encyclopedia article about moderator


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