9. Descent of water; a cascade; a cataract; a rush of water down a
precipice or steep; -- usually in the plural, sometimes in the
singular; as, the falls of Niagara.
10. The discharge of a river or current of water into the ocean, or
into a lake or pond; as, the fall of the Po into the Gulf of Venice.
Addison.
11. Extent of descent; the distance which anything falls; as, the water
of a stream has a fall of five feet.