(n.) The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; rapidity of speech; rapidity of growth or improvement.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). rapidity. Retrieved September 22, 2026, from http://smartdefine.org/rapidity/definitions/2052630 |
| Chicago | Webster's. 2011. "rapidity" http://smartdefine.org/rapidity/definitions/2052630 (accessed September 22, 2026). |
| Harvard | Webster's 2011, rapidity, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/rapidity/definitions/2052630>. |
| MLA | Webster's. "rapidity" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/rapidity/definitions/2052630> |