nouns
an organization founded and united for a specific purpose
an establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated
is a type of (narrower)
a public or private structure (business or governmental or educational) including buildings and equipment for business or residence
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"
is a type of (narrower)
a specific practice of long standing
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"
a hospital for mentally incompetent or unbalanced person