institution

(noun) an organization founded and united for a specific purpose. Synonyms: establishment.

(noun) an establishment consisting of a building or complex of buildings where an organization for the promotion of some cause is situated.

(noun) a custom that for a long time has been an important feature of some group or society. Examples: "The institution of marriage." "The institution of slavery." "He had become an institution in the theater."

(noun) the act of starting something for the first time; introducing something new. Synonyms: initiation, founding, foundation, origination, creation, innovation, introduction, instauration. Examples: "She looked forward to her initiation as an adult." "The foundation of a new scientific society."

(noun) a hospital for mentally incompetent or unbalanced person. Synonyms: mental hospital, psychiatric hospital, mental institution, mental home, insane asylum, asylum.