bylaw

Where does the word "bylaw" come from? It comes from Old Norse býlǫg, passing through Middle English before entering English (1600s).

Bylaw’s story begins in Old Norse: býlǫg meant “village law.” From 'býr', village or farmstead, the same element found in English place-names ending in -by like Whitby and Derby. By 1200s, the word had taken hold in Middle English as bilawe. Used in the Danelaw for local rules set by a township. It reached English by 1600s as bylaw. The 'by' was later reinterpreted as 'secondary' or 'side', shaping the modern sense of a subsidiary rule. Today, bylaw means a rule made by a local authority or an organization for its own members.

1. Stage 1 · Old Norse · medieval býlǫg "village law", from 'býr', village or farmstead, the same element found in English place-names ending in -by like Whitby and Derby.
2. Stage 2 · Middle English · 1200s bilawe "local custom or law", used in the Danelaw for local rules set by a township.
3. Stage 3 · English · 1600s bylaw "a rule made by a local body or organization", the 'by' was later reinterpreted as 'secondary' or 'side', shaping the modern sense of a subsidiary rule.