n.1 the elected head of a republican State.
2 the head of a society or council etc.
3 the head of certain colleges.
4 US a the head of a university. b the head of a company, etc.
5 a person in charge of a meeting, council, etc.
Derivatives:
presidential adj. presidentially adv. presidentship n.
Etymology: ME f. OF f. L (as PRESIDE)