rapidity

rapidity

English

Etymology

rapid +‎ -ity, from French rapidité, from Latin rapiditas.

Pronunciation

• IPA^(key): /ɹəˈpɪdɪti/

Noun

rapidity (countable and uncountable, plural rapidities)

1. speed, swiftness; the condition of being rapid
   • 1944 November and December, Talisman, “A Broadening Horizon”, in Railway Magazine, page 340:

     Although appreciating the rapidity and frequency of the Southern electric services I was now to use on short journeys, I became more than ever convinced that electric traction offers very little of interest to the dyed-in-the-wool railwayist.

2. (physics) A measure of velocity relative to the speed of light
3. (physics) A measure of the velocity of a particle in a beam relative to the beam's axis

Derived terms

• midrapidity
• pseudorapidity

Translations

speed, swiftness

Bulgarian: бързина (bg) f (bǎrzina) Esperanto: rapideco French: rapidité (fr) f, célérité (fr) f Greek: ταχύτητα (el) f (tachýtita) Ido: rapideso (io) Italian: rapidità (it) f Polish: szybkość (pl) f Romanian: rapiditate (ro) f Spanish: rapidez (es) f, celeridad (es) f Swedish: fart (sv) c, snabbhet (sv) c, snärt (sv) c Tagalog: bilis, tulin (tl), taloiryap Volapük: vif (vo)