rapidity Meaning, Definition & Usage

  1. noun a rate that is rapid
    quickness; rapidness; celerity; speediness.

WordNet

Ra*pid"i*ty noun
Etymology
L. rapiditas: cf. F. rapidité.
Definitions
  1. The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of growth or improvement. Syn. -- -- Rapidness; haste; speed; celerity; velocity; swiftness; fleetness; quickness; agility.

Webster 1913