Dictionary.net

To be set, or to sit, in the place of authority; to occupy the place of president, chairman, moderator, director, etc.; to direct, control, and regulate, as chief officer; as, to preside at a public meeting; to preside over the senate.

To exercise superintendence; to watch over.

To direct or control; act as head; to direct the proceedings of a meeting.

To direct or control, esp. at a meeting: to superintend.

To govern; direct; superintend.

To sit in authority over others; act as head or ruler.