olemus
(a) organisatsioonisisene õigusnorm
(b) seadusest madalam õigusakt:
ministeeriumi, kohaliku omavalitsuse vms tasemel,
on loodud delegeeritud seadusandlusega

Wiktionary:
1. a local custom or law of a settlement or district
2. a rule made by a local authority to regulate its own affairs
3. a law or rule governing the internal affairs of an organization (e.g., corporation or business)

ülevaateid
https://en.wikipedia.org/wiki/By-law

vt ka
- sisekord; sise-eeskiri; reglement; põhikiri