- a rapid state or quality; quickness; celerity.
Also rap·id·ness [rap-id-nis] /ˈræp ɪd nɪs/.
Origin of rapidity
SynonymsSee more synonyms for rapidity on Thesaurus.com
swiftness, fleetness. See speed.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for rapidity
I just kind of knew it based on the rapidity of the infections.Etta James, Who Blazed Trail for Women in R&B, Dead at 73
January 21, 2012
All these thoughts came to her with rapidity, as Crane talked with masterly judgment.
He fired his volley of explanation at his employer with the rapidity of a Maxim gun.
To Linda it was almost a miracle, the rapidity with which a house could be erected in California.Her Father's Daughter
He was terrified at the rapidity with which he had been involved in such dangers—decoyed into it.The Secret Agent
Hence he moved with rapidity and precision, and was never taken by surprise.Cleveland Past and Present
Word Origin and History for rapidity
1650s, from French rapidité and directly from Latin rapiditatem (nominative rapiditas) "swiftness, rapidity, velocity," from rapidus "hasty, swift, rapid" (see rapid).
Online Etymology Dictionary, © 2010 Douglas Harper