- Needing only a brief exposure time. (of a lens, plate, film, etc.)
- Steep, changing altitude quickly. (of a slope)
- (obsolete, dialectal) Happy.
- Very swift or quick.
"a rapid stream;"
- (England, dialectal) Violent, severe.
- (archaic or colloquial) Rapidly.
- (dated) A burst of rapid fire.
- (often in the plural) a rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water.