Definitions
1.NounA custom or practice of a society or community."The institution of marriage is present in many cultures but its details vary widely across them."
2.NounA long-established organization or type of organization, particularly one involved with education, public service, or charity work."The University of the South Pacific is the only internationally accredited institution of higher education in Oceania."
3.NounThe building or buildings which house such an organization."He's been in an institution since the crash."
4.NounA mental institution.
5.NounAny facility where people (especially those who are mentally or physically disabled or sick, or who are prisoners) are committed (confined), where their freedom to leave is restricted.
6.NounAny long established and respected place or business."Over time, the local pub has become something of an institution."
7.NounA person long established in a place, position, or field."She's not just any old scholar; she is an institution."
8.NounThe act of instituting something."The institution of higher speed limits was a popular move but increased the severity of crashes."
9.NounThe act by which a bishop commits a cure of souls to a priest. (Can we clean up this sense?)
10.NounThat which institutes or instructs, particularly a textbook or system of elements or rules.
11.NounA correctional institution.