Abbr. ON or Ont. 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.
(ŏn-târ'ē-ō') 