moderator

• any substance used to slow down neutrons in nuclear reactors
• in the Presbyterian church, the officer who presides over a synod or general assembly
• someone who presides over a forum or debate
• someone who mediates disputes and attempts to avoid violence
• One who, or that which, moderates, restrains, or pacifies
• The officer who presides over an assembly to preserve order, propose questions, regulate the proceedings, and declare the votes
• In the University of Oxford, an examiner for moderations
• A mechamical arrangement for regulating motion in a machine, or producing equality of effect

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