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. [1913 Webster]

Angling was . . . a moderator of passions. --Walton. [1913 Webster]

2. The officer who presides over an assembly or discussion to preserve order, propose questions, regulate the proceedings, and declare the votes. [1913 Webster]

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. [1913 Webster]

4. A mechanical arrangement for regulating motion in a machine, or producing equality of effect. [1913 Webster]

The Collaborative International Dictionary of English. 2000.