Ra-pĭd'ĭ-ty, n.

n. [Lat. rapiditas, Fr. rapidité, It. rapidità, Sp. rapidez.]

1. The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; the rapidity of motion of any kind; rapidity of speech.
2. Quickness of progression or advance; as, rapidity of growth or improvement.

Syn.—Rapidness; haste; speed; celerity; velocity; swiftness; fleetness; agility.