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1. Abbr. ON or Ont. A province of east-central Canada. Originally the western half of the old Province of Quebec, it was separated into Upper Canada in 1791 following the arrival of Loyalist settlers during the American Revolution. Reunited with Lower Canada (now Quebec) in 1841 as part of the Province of Canada, it once again became a separate province with Canada's confederation in 1867. Toronto is the capital and the largest city.
2. A city of southern California east of Los Angeles near Riverside and San Bernardino. Founded in 1882, it grew as an agricultural center.


1. (Placename) 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. or ON
2. (Placename) Lake Ontario 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)


(ɒnˈtɛər iˌoʊ)

1. a province in S Canada, bordering on the Great Lakes. 11,407,700; 412,582 sq. mi. (1,068,585 sq. km). Cap.: Toronto. Abbr.: ON, Ont.
2. Lake, a lake between the northeastern U.S. and S Canada, between New York and Ontario: the smallest of the Great Lakes. 7540 sq. mi. (19,530 sq. km).
3. a city in SW California, E of Los Angeles. 144,854.
On•tar′i•an, adj., n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Ontario - the smallest of the Great LakesOntario - the smallest of the Great Lakes  
Great Lakes - a group of five large, interconnected lakes in central North America
2.Ontario - a prosperous and industrialized province in central Canada
Canada - a nation in northern North America; the French were the first Europeans to settle in mainland Canada; "the border between the United States and Canada is the longest unguarded border in the world"
Canadian capital, capital of Canada, Ottawa - the capital of Canada (located in southeastern Ontario across the Ottawa river from Quebec)
Hamilton - a port city in southeastern Ontario at the western end of Lake Ontario
Kingston - a town in southeast Ontario on Lake Ontario near the head of the Saint Lawrence River
Sault Sainte Marie - a town of southern Ontario opposite northern Michigan
Sudbury - a city in south central Canada in Ontario; a major nickel mining center
Thunder Bay - a port city in Ontario on Lake Superior
Toronto - the provincial capital and largest city in Ontario (and the largest city in Canada)
Canadian Falls, Horseshoe Falls - a part of Niagara Falls in Ontario
James Bay - the southern extension of Hudson Bay in Canada between western Quebec and northeastern Ontario
Lake Saint Clair, Lake St. Clair - a lake between Ontario and Michigan; connected with Lake Huron and Lake Erie
Niagara, Niagara Falls - waterfall in Canada is the Horseshoe Falls; in the United States it is the American Falls
Severn, Severn River - a river in Ontario that flows northeast into Hudson Bay
References in periodicals archive ?
Ontario is taking action to address the intergenerational impacts of slavery, an extended history of racial stigmatization and ongoing systemic racism that contributes to disparity in outcomes for Black Ontarians.
Identity profile, language skills-usage, feeling of threat and ego-vitality of: Francophone Quebecers, Acadians and Franco -Ontarians Francophone Acadians, New Franco- Quebecers Brunswick Ontarians n = 204 n = 227 n = 227 M M M Identity Canadian [4.
Pharmacists across the province play an important role in helping Ontarians stay healthy through immunization.
However as of July 2015, five projects have continued without providing the necessary plans, putting Ontarians at risk for paying for the costs of site closure and clean-up.
Starting June 27, Ontarians can begin accessing the park again for recreational activities, including camping and canoeing.
It will also help in accessing jobs, education and training opportunities, while continuing to maintain income security for vulnerable Ontarians.
As part of our Centennial celebrations, we are asking Ontarians to share with us their favourite memories of the Museum in a program called ROMReCollects.
is urging Ontarians to support the project because of the economic benefits and job opportunities the project would bring to Ontario workers.
Ontarians who make a living in the lucrative horse racing industry will now have to find some other source of income to pay for all the barns, broodmares and training facilities that sprung up during the horse racing boom.
How many Ontarians are aware that abortion on demand is covered by our tax dollars?
While we Ontarians no longer rip them off in any obvious ways, I am sure that fellow Canadians in those parts will find reasons for blaming us for what they don't like about Canada.
CropLife Canada wants the government of Ontario to defer consultations on draft regulations to ban the sale and use of some pesticides until government officials develop scientific criteria for Ontarians to comment on.