Open English Wordnet
Nouns
(n)institutionan establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated
(n)institutiona 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”
(n)initiation, founding, foundation, institution, origination, creation, innovation, introduction, instaurationthe 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”
(n)mental hospital, psychiatric hospital, mental institution, institution, mental home, insane asylum, asyluma hospital for mentally incompetent or unbalanced person