noun

• A custom or practice of a society or community.
• A long established and respected organization, particularly one involved with education, public service, or charity work.
• The building or buildings which house such an organization.
• (informal) Any long established and respected place or business.
• (informal) A person long established in a place, position, or field.
• The act of instituting something.
• (Christianity) The act by which a bishop commits a cure of souls to a priest.
• (obsolete) That which institutes or instructs, particularly a textbook or system of elements or rules.
• (informal) Ellipsis of mental institution. [(derogatory slang) A psychiatric hospital, or the psychiatric ward of a hospital.]