an administrative district and former city within Toronto, Ontario, Canada. Comprising the city's west-end, Etobicoke is bordered on the south by Lake Ontario, on the east by the Humber River, on the west by Etobicoke Creek, the cities of Brampton, and Mississauga, the Toronto Pearson International Airport (a small portion of the airport extends into Etobicoke), and on the north by the city of Vaughan at Steeles Avenue West.