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Ontario

American  
[on-tair-ee-oh] / ɒnˈtɛər iˌoʊ /

noun

  1. a province in southern Canada, bordering on the Great Lakes. 412,582 square miles (1,068,585 square kilometers). Toronto.

  2. Lake Ontario, a lake between the northeastern United States and southern Canada, between New York and Ontario province: the smallest of the Great Lakes. 193 miles (310 kilometers) long; 7,540 square miles (19,530 square kilometers).

  3. a city in southwestern California, east of Los Angeles.


Ontario British  
/ ɒnˈtɛərɪəʊ /

noun

  1. Abbreviation: Ont..   ON.  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: 12 392 721 (2004 est). Area: 891 198 sq km (344 092 sq miles)

  2. a lake between the US 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: 19 684 sq km (7600 sq miles)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Ontario Cultural  
  1. Province in central Canada, bordered by Hudson Bay and James Bay to the north; Quebec to the east; the St. Lawrence River, Lake Ontario, Lake Erie, Lake Huron, Lake Superior, and Minnesota to the south; and Manitoba to the west. Its capital and largest city is Toronto.


Discover More

Ontario is the most heavily industrialized, populous, and prosperous province in Canada.

The Canadian side of Niagara Falls is in southern Ontario.

Ottawa, Canada's capital, is in southeastern Ontario.

Other Word Forms

  • Ontarian adjective
  • Ontaric adjective

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

On the same court and exactly one year after claiming its first Southern Section Open Division crown, Ontario Christian found out just how hard it is to repeat.

From Los Angeles Times

Sierra Canyon will play top-seeded Ontario Christian in Saturday’s 8 p.m. final at Toyota Arena.

From Los Angeles Times

The fossil is expected to go on public display at the Royal Ontario Museum in Toronto, Canada.

From Science Daily

Ontario and Quebec are the provinces set to see the biggest expansion, with 27 and 15 new stores, respectively, while Loblaw plans to add 24 locations in Western Canada and four more in Eastern Canada.

From The Wall Street Journal

Ontario Christian will host Sage Hill, a 59-58 winner over Oak Park.

From Los Angeles Times