Definition of institution
1a : an established organization or corporation (such as a bank or university) especially of a public character financial institutions
b : a facility or establishment in which people (such as the sick or needy) live and receive care typically in a confined setting and often without individual consent … the testator disinherited her siblings over their efforts to have her committed to a mental institution in the wake of several suicide attempts.— William M. McGovern Jr.
c : a significant practice, relationship, or organization in a society or culture the institution of marriage also : something or someone firmly associated with a place or thing she has become an institution in the theater
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