I. On ‧ ta ‧ ri ‧ o /ɒnˈte ə riəʊ $ ɑːn-/ BrE AmE
a ↑ province in the east of central Canada, containing the country's largest city, Toronto, and over a third of its population
II. Ontario, Lake BrE AmE
the smallest of the five ↑ Great Lakes , between the US and Canada. Its main port is the Canadian city of Toronto.