the falls of the Niagara River, on the border between the US and Canada between Lake Erie and Lake Ontario: divided by Goat Island into the American Falls, 50 m (167 ft) high and approximately 300 m (985 ft) wide, and the Horseshoe or Canadian Falls, 47 m (158 ft) high and by some estimates well over 800 m (2625 ft) wide
2. (functioning as singular)
a city in W New York State, situated at the falls of the Niagara River. Pop: 78 815 (2001)
3. (functioning as singular)
a city in S Canada, in SE Ontario on the Niagara River just below the falls: linked to the city of Niagara Falls in the US by three bridges. Pop: 78 815 (2001)
Niagara Falls in American English
1.
large waterfall on the Niagara River: it is divided by an island into two falls, Horseshoe (or Canadian)Falls, c. 160 ft (49 m) high, & American Falls, c. 167 ft (51 m) high
2.
city in W N.Y., near Niagara Falls: pop. 56,000
3.
city in SE Ontario, Canada, opposite Niagara Falls: pop. 77,000