What is the meaning of Institution?

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.

Ellipsis of mental institution.

Any long established and respected place or business.

A person long established in a place, position, or field.

The act of instituting something.

The act by which a bishop commits a cure of souls to a priest. (Can we clean up this sense?)

That which institutes or instructs, particularly a textbook or system of elements or rules.

Ellipsis of correctional institution.

institution

institution

an institution (an established organization)

an institution (a habit)

an institution (a person)

a department (at a university)

Source: wiktionary.org