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
2
: an act of instituting : establishment
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Merriam-Webster unabridged
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Time Traveler for institution
The first known use of institution was in the 15th century
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