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The Collaborative International Dictionary of English v.0.48 (gcide)

Moderator \Mod"er*a`tor\, n. [L.: cf. F. mod['e]rateur.]
1. One who, or that which, moderates, restrains, or pacifies.
--Sir W. Raleigh.
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Angling was . . . a moderator of passions. --Walton.
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2. The officer who presides over an assembly or discussion to
preserve order, propose questions, regulate the
proceedings, and declare the votes.
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3. In the University of Oxford, an examiner for moderations;
at Cambridge, the superintendant of examinations for
degrees; at Dublin, either the first (senior) or second
(junior) in rank in an examination for the degree of
Bachelor of Arts.
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4. A mechanical arrangement for regulating motion in a
machine, or producing equality of effect.
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