Mŏd'er-ā'tor, n.

n. [Lat., It. moderatore, Sp. moderador, Fr. modérateur.]

1. One who, or that which, moderates or restrains.
2. Hence, the person who presides over a meeting or assembly of people to preserve order, propose questions, regulate the proceedings, and declare the vote; as, the moderator of a town-meeting, or of a society; also, one who presides at a university examination, or discussion.