from The American Heritage® Dictionary of the English Language, 4th Edition
- A province of east-central Canada. It joined the confederation in 1867. First visited by French explorers in the early 1600s, it passed to the British in 1763 and became part of the province of Quebec in 1774. It was called Upper Canada after its division from Quebec (then Lower Canada) in 1791. Reunited with Lower Canada in 1841, it became a separate province with the formation of the confederation. Toronto is the capital and the largest city. Population: 12,200,000.
- A city of southern California east of Los Angeles. It is a residential and industrial center in a citrus-growing region. Population: 173,000.
- LakeOntario The smallest of the Great Lakes, between southeast Ontario, Canada, and northwest New York. The St. Lawrence Seaway and Welland Ship Canal connect with the lake to afford passage by oceangoing vessels to the other Great Lakes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. A lake between Ontario province and New York State.
- proper n. A province in eastern Canada that has Toronto as its capital.
- proper n. A city in California.
- proper n. A town in Oregon.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a prosperous and industrialized province in central Canada
- n. the smallest of the Great Lakes
Probably from Wyandot ontari:io ("great lake"). (Wiktionary)