- 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.
a steep fall of water, as of a stream, from a height; cascade
A steep descent of water from a height; a cascade.
(third-person singular simple present waterfalls, present participle waterfalling, simple past and past participle waterfalled)
- (intransitive) To fall like a waterfall.