riding [Brit.E "an administrative division of a county, esp. Yorkshire" < ME thriding < ON thrithjungr a third part; the th- was lost by assimilation to the previous -t or -th in the compounds East Thriding, North Thriding, West Thriding]
1 n. Hist. in Upper Canada, a subdivision of a county, set up primarily for election purposes.
See also: county (see note)
2 n. a district encompassing a body of electors entitled to return a member to the House of Commons or to a legislative assembly.
See also: electoral district