A parachute jump from high structures and precipitous earth formations, typically from heights of 305 meters (1,000 feet) or less.
(intransitive) To make such a jump.
Origin of base-jump
- b(uilding) a(ntenna tower) s(pan) e(arth) jump
From American Heritage Dictionary of the English Language, 5th Edition
- Building, Antenna-tower, Span, Earth