a rule or regulation made by a local authority which affects the public, which orders something to be done, or in some cases, something not to be done
A law or rule governing the internal affairs of an organization. Since bylaw is singular, when used in the context of constitution and bylaws, it follows that the bylaws are a set ( system) of rules that govern, but are subordinate or inferior to the language of the constution.
a rule adopted by a cooperative to govern the conduct of its affairs. Bylaws are often the source of directors' responsibilities and liabilities.