(1):
(n.) An upper servant of an inn.
(2):
(n.) An officer having the direction and management of the private chambers of a nobleman or monarch; hence, in Europe, one of the high officers of a court.
(3):
(n.) An officer or servant who has charge of a chamber or chambers.
(4):
(n.) A treasurer or receiver of public money; as, the chamberlain of London, of North Wales, etc.