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A historical region and province of British North America on the upper St. Lawrence River and the Great Lakes, roughly coextensive with southern Ontario, Canada. Formed in 1791 from the western half of the Province of Quebec (1763-1791), it joined Lower Canada in 1841 to form the Province of Canada (1841-1867).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Placename) history (1791–1841) the official name of the region of Canada lying southwest of the Ottawa River and north of the lower Great Lakes. Compare Lower Canada
2. (Placename) (esp in E Canada) another name for Ontario
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a former British province in Canada 1791–1840: now the S part of Ontario province.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.