swiftness; speed.

1480–90; earlier celerite < Middle French < Latin celeritās, equivalent to celer swift + -itās -ity

alacrity, dispatch, briskness. See speed.
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World English Dictionary
celerity (sɪˈlɛrɪtɪ)
rapidity; swiftness; speed
[C15: from Old French celerite, from Latin celeritās, from celer swift]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 15c., from M.Fr. célérité, from L. celeritatem (nom. celeritas), from celer "swift," from PIE base *kel- "to drive, set in swift motion" (cf. Skt. carati "goes," Gk. keles "fast horse or ship," keleuthos "journey, road," Lith. sulys "a gallop," O.H.G. scelo "stallion").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The findings support the swiftness or celerity element of deterrence theory.
For deep water waves, the wave height is virtually unaffected by the depth and the wave celerity is unaffected by the bottom.
The kinematic wave celerity, c k, is interpreted as the velocity at which a disturbance travels through the channel network.
As the storm sewer fills, the flow will return to subcritical as the celerity increases rapidly.
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