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: 12 851 821 (2011 est). Area: 891 198 sq km (344 092 sq miles)
Abbreviation: Ont., ON
2. Lake Ontario
Ontario in American English
(ɑnˈtɛrioʊ)
1.
province of SC Canada, between the Great Lakes & Hudson Bay: 412,580 sq mi (1,068,578 sq km); pop. 10,754,000; cap. Toronto
abbrev. ON or Ont
2.
city in S Calif.: pop. 158,000
3.
Lakesmallest & easternmost of the Great Lakes, between N.Y. & Ontario, Canada: 7,540 sq mi (19,529 sq km)
Derived forms
Ontarian (Onˈtarian)
adjective, noun
Word origin
< Fr < Iroquoian, lit., fine lake; (sense 2) after the Cdn province