Etymology
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bylaw (n.)

also by-law, late 13c., bilage "local ordinance," from Old Norse or Old Danish bi-lagu "town law," from byr "place where people dwell, town, village," from bua "to dwell" (from PIE root *bheue- "to be, exist, grow") + lagu "law" (see law). So, a local law pertaining to local residents, hence "a standing rule of a corporation or association for regulation of its organization and conduct." Sense influenced by by.

updated on September 07, 2017

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Definitions of bylaw from WordNet

bylaw (n.)
a rule adopted by an organization in order to regulate its own affairs and the behavior of its members;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.