1 (often foll. by at, over) be in a position of authority, esp. as the chairperson or president of a meeting.
2 a exercise control or authority. b (foll. by at) colloq. play an instrument in company (presided at the piano).
Etymology: F preacutesider f. L praesidere (as PRAE-, sedere sit)
Useful english dictionary. 2012.