- The definition of a waterfall is a steep cliff or incline down which water cascades.
Niagara Falls is an example of a waterfall.
Niagara Falls is a famous waterfall.
(third-person singular simple present waterfalls, present participle waterfalling, simple past and past participle waterfalled)
- (intransitive) To fall like a waterfall.
From Middle English waterfal, waterfalle, from Old English wÃ¦terÄ¡efeall (â€œwaterfallâ€), equivalent to water +â€Ž fall. Cognate with West Frisian wetterfal (â€œwaterfallâ€), Dutch waterval (â€œwaterfallâ€), German Wasserfall (â€œwaterfallâ€), Swedish vattenfall (â€œwaterfallâ€).