RAPID'ITY, noun [Latin rapiditas.] 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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI