olemus
ühiskondlik korraldus või tava,
näiteks poliitiline, majanduslik, kultuuriinstitutsioon

Wiktionary:
1. a custom or practice of a society or community
The institution of marriage is present in many cultures but its details vary widely across them.

Open Education Sociology Dictionary:
a large-scale social arrangement that is stable and predictable, created and maintained to serve the needs of society
Examples of Institution
- criminal justice system
- education
- economy
- environment
- family
- government
- media
- politics
- religion

ülevaateid
https://en.wikipedia.org/wiki/Institution

vt ka
- asutus (1)