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English definition of “moderator”

moderator

noun [C]     /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 .Diplomacy and mediation 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.Diplomacy and mediation 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.People who analyse and judge 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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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