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English definition of “moderator”

moderator

noun [C]     /ˈmɒdəreɪtər/
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. → Compare mediator
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 noun from the Cambridge Business English Dictionary © Cambridge University Press)
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