Ontario

geographical name

On·​tar·​io än-ˈter-ē-ˌō 

1

province of eastern Canada between the Great Lakes and Hudson Bay and bordering on the United States (New York, Michigan, and Minnesota); capital Toronto area 350,814 square miles (908,608 square kilometers)

Note: Ontario is the most populous province of Canada.

2

city in southwestern California northwest of Riverside

Ontarian

än-ˈter-ē-ən 

adjective or noun