1 a province of central Canada: lies mostly on the Canadian Shield and contains the fertile plain of the lower Great Lakes and the St Lawrence River, one of the world's leading industrial areas; the second largest and the most populous province. Capital: Toronto. Pop.: 11407700 (1997 est.). Area: 891198 sq. km (344092 sq. miles), (Abbrevs.)
2 Lake. a lake between the U.S. and Canada, bordering on New York State and Ontario province: the smallest of the Great Lakes; linked with Lake Erie by the Niagara River and Welland Canal; drained by the St Lawrence. Area: 19684 sq. km (7600 sq. miles)
Ontarian, Ontarioan n, adj
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