Latin, meaning: speed, swiftness, rapidity, quickness.
Found on http://archives.nd.edu/ccc.htm


Celeritas /kɛ`lɛritas/ or /tʃɛ`lɛritas/ is a Latin word, translated as "swiftness" or "speed". It is often given as the origin of the symbol c, the universal notation for the speed of light in a vacuum, as popularized in Albert Einstein`s famous equation E = mc². In SI units, the speed of light in a vacuum is defined as 299,792,458 me...
Found on http://en.wikipedia.org/wiki/Celeritas
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