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English definition of “moderator”

moderator

noun [C] uk   /ˈmɒd.ər.eɪ.tər/ us    /ˈmɑː.də.reɪ.t̬ɚ/
(US usually mediator) formal someone who tries to help other people come to an agreement: An independent moderator should be appointed to oversee the negotiations. 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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