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English definition of “moderator”

moderator

noun [C]  /ˈmɑd·əˌreɪ·t̬ər/ us  

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)
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