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.

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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)

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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.

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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

And manufacturing in Canada contracted 1.4%, more than countering an increase in December as the automotive sector notched the biggest retreat since September 2021 due to an extended winter shutdown at assembly plants in Ontario.

From The Wall Street Journal

Arkansas doesn’t require front license plates, so the number of cars from far-flung origins like Washington, Montana, and Ontario stick out.

From Literature

The automaker also builds the heavy-duty Silverado at a plant in Ontario, Canada.

From The Wall Street Journal

Victor Glover — a former Ontario High School wrestler and Navy test pilot who often wears his excitement on his royal-blue jumpsuit sleeve — will be the first Black person to reach the moon.

From Los Angeles Times

His grandfather, David Lewis, was one of the party's founding members and was its leader in the 1970s, while his father, Stephen Lewis, led the Ontario NDP.

From BBC