from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A law or rule governing the internal affairs of an organization.
- n. A secondary law.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A local custom or law of a settlement or district.
- n. A rule made by a local authority to regulate its own affairs.
- n. A law or rule governing the internal affairs of an organization (e.g., corporation or business).
Middle English bilawe, body of local regulations; akin to Danish by-lag, township ordinance : Old Norse bȳr, settlement.(American Heritage® Dictionary of the English Language, Fourth Edition)
Alteration of byrlaw, but popularly interpreted as by- + law. (Wiktionary)