LATIN DICTIONARYLexicon Latīnum
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“swiftness” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

swiftness
celeritas: velocitas: pernicitas (fleetness); or by circumlocution with the adjectives. The swiftness of a stream or river, rapiditas fluminis: swiftness of time, temporis celeritas.

Quick answer

What is the Latin word for swiftness?
The usual Latin words for “swiftness” are celeritās, vēlōcitās, pernīcĭtas; also rīvō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.