Meaning of “moderator” in the English Dictionary

"moderator" in British English

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moderatornoun [ C ]

uk /ˈmɒd.ər.eɪ.tər/ us /ˈmɑː.də.reɪ.t̬ɚ/

someone who tries to help other people come to an agreement:

An independent moderator should be appointed to oversee the negotiations.

mainly US someone who makes certain that a formal discussion happens without problems and follows the rules:

He challenged the president to a series of TV debates. Just the two of them, with no moderator.

UK specialized education someone who makes certain that all the people marking an examination use the same standards:

The final marks awarded for coursework will depend upon the moderator.

internet & telecoms someone who makes sure that the rules of an internet discussion are not broken, for example by removing any threatening or offensive messages

(Definition of “moderator” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"moderator" in American English

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moderatornoun [ C ]

us /ˈmɑd·əˌreɪ·t̬ər/

moderator noun [ C ] (SUBSTANCE)

physics a substance that slows neutrons in a nuclear reactor

moderator noun [ C ] (MANAGER)

the manager of a public discussion:

The moderator allowed each side two minutes to sum up at the end of the televised debate.

(Definition of “moderator” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"moderator" in Business English

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moderatornoun [ C ]

uk /ˈmɒdəreɪtər/ us

someone who controls and leads a discussion between a group of people, but does not take any side in it:

A panel of business people will ask the candidates questions, with a local journalist as moderator.
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INTERNET someone who makes sure that the rules of an internet discussion are not broken, for example by removing any threatening or offensive comments:

She began posting on the message board and was later asked to be a moderator.

(Definition of “moderator” from the Cambridge Business English Dictionary © Cambridge University Press)