What is the meaning of Rapid?

Very swift or quick.

Steep, changing altitude quickly. (of a slope)

Needing only a brief exposure time. (of a lens, plate, film, etc.)

Violent, severe.

Happy.

Rapidly.

A rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water.

A burst of rapid fire.

Short for rapid chess.

fast, quick, rapid, swift, speedy, prompt, expeditious

quickly, rapidly, swiftly, speedily, promptly, expeditiously

Source: wiktionary.org