Institution
WordNet
noun
(1) The act of starting something for the first time; introducing something new
"She looked forward to her initiation as an adult"
"The foundation of a new scientific society"
"He regards the fork as a modern introduction"
(2) An establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated
(3) A hospital for mentally incompetent or unbalanced person
(4) A custom that for a long time has been an important feature of some group or society
"The institution of marriage"
"The institution of slavery"
"He had become an institution in the theater"
(5) An organization founded and united for a specific purpose
WiktionaryText
Noun
- An established organisation, especially one dedicated to education, public service, culture or the care of the destitute, poor etc.
- The building which houses such an organisation.
- A custom or practice of a society or community - marriage for example.
- A person long established with a certain place or position.
- The act of instituting.