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[on-tair-ee-oh] /ɒnˈtɛər iˌoʊ/
a province in S Canada, bordering on the Great Lakes. 412,582 sq. mi. (1,068,585 sq. km).
Capital: Toronto.
Lake, a lake between the NE United States and S Canada, between New York and Ontario province: the smallest of the Great Lakes. 193 miles (310 km) long; 7540 sq. mi. (19,530 sq. km).
a city in SW California, E of Los Angeles.
Related forms
Ontarian, Ontaric
[on-tar-ik] /ɒnˈtær ɪk/ (Show IPA),
adjective, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for Ontario
Contemporary Examples
Historical Examples
  • Ontario has in its nickel-mines of Sudbury a mineral treasure not found elsewhere in equal abundance in the world.

  • In India he found monasteries, even in the northern woods of Ontario.

    Child and Country Will Levington Comfort
  • The Ontario registry has five district offices, as well as the central one at Toronto.

  • It's only a matter of some fifty thousand dollars and his farm in Ontario.

    The Heart of Unaga Ridgwell Cullum
  • One of its frontiers lies on the vast sheet of Ontario, while Champlain stretches nearly a hundred miles along another.

    The Last of the Mohicans James Fenimore Cooper
British Dictionary definitions for Ontario


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) Abbreviation Ont., ON
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)
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
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Word Origin and History for Ontario

from Mohawk (Iroquoian) ontari:io "beautiful lake" or "great lake," from /-qtar-/ "lake, river." Related: Ontarian.

Online Etymology Dictionary, © 2010 Douglas Harper
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Ontario in Culture

Ontario definition

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.

Note: The Canadian side of Niagara Falls is in southern Ontario.
Note: Ottawa, Canada's capital, is in southeastern Ontario.
Note: Ontario is the most heavily industrialized, populous, and prosperous province in Canada.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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