Definitions from Wiktionary (moderator)

▸ noun:  Someone who moderates.
▸ noun:  An arbitrator or mediator.
▸ noun:  The chair or president of a meeting, etc.
▸ noun:  (Internet) A person who enforces the rules of a discussion forum by deleting posts, banning users, etc.
▸ noun:  The person who presides over a synod of a Presbyterian Church.
▸ noun:  (nuclear physics) A substance (often water or graphite) used to decrease the speed of fast neutrons in a nuclear reactor and hence increase likelihood of fission.
▸ noun:  A device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.
▸ noun:  (UK) An examiner at Oxford and Cambridge universities.
▸ noun:  (Ireland) At the University of Dublin, either the first (senior) or second (junior) in rank in an examination for the degree of Bachelor of Arts.
▸ noun:  (UK) Someone who supervises and monitors the setting and marking of examinations by different people to ensure consistency of standards.
▸ noun:  A mechanical arrangement for regulating motion in a machine, or producing equality of effect.
▸ noun:  (historical) A kind of lamp in which the flow of the oil to the wick is regulated.
▸ Also see moderator

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