moderator Hear it!

moderator definition

mod·era·tor (mäd′ər āt′ər)

noun

a person or thing that moderates; specif.,
  1. a person who presides at a town meeting, debate, assembly, etc.
  2. the presiding officer of a governing body, as of the Presbyterian Church
  3. a substance, as graphite or heavy water, used to slow down high-energy neutrons in a nuclear reactor

Etymology: ME moderatour < L moderator

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