noun
rapidity
Rapidity (noun) means the quality of being fast; speed.
noun
1
The quality of being fast; speed.
2
(physics) A measure of how fast something is moving compared with the speed of light, calculated using the hyperbolic arctangent of its speed as a fraction of light speed.
3
(physics) A measure of how fast a particle in a beam is moving along the beam's own direction.
Vocabulary Flow
Build your vocabulary from words like rapidity.
Vocabulary Flow serves the next word, and the next — meaning, pronunciation and an example each time. Practice at your level, or learn English in your own language.
Start vocabulary practice
Etymology
Formed from rapid plus -ity, echoing French rapidité, which itself came from Latin rapiditas.
Synonyms
View more →Antonyms
Related words
Rhymes for rapidity
See all rhymes for rapidity →Frequently asked questions
What is the meaning of rapidity?
"rapidity" (noun) means the quality of being fast; speed.
What is another word for rapidity?
Other words for "rapidity" include celerity, rapidness, speediness, quickness.
What is the opposite of rapidity?
The opposite of "rapidity" is slowness.
What are the different meanings of rapidity?
"rapidity" has 3 main meanings: 1. The quality of being fast; speed; 2. (physics) A measure of how fast something is moving compared with the speed of light, calculated using the hyperbolic arctangent of its speed as a fraction of light speed; 3. (physics) A measure of how fast a particle in a beam is moving along the beam's own direction.
