Webster 1913 Edition
rapiditas: cf. F.
The quality or state of being rapid; swiftness; celerity; velocity;
rapidityof a current;
rapidityof growth or improvement
Syn. – Rapidness; haste; speed; celerity; velocity; swiftness; fleetness; quickness; agility.
Webster 1828 Edition
1.Swiftness; celerity; velocity; as the rapidity of a current; the rapidity of motion of any kind.
2.Haste in utterance; as the rapidity of speech or pronunciation.
3.Quickness of progression or advance; as rapidity of growth or improvement.