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rapidity

[ruh-pid-i-tee] /rəˈpɪd ɪ ti/
noun
1.
a rapid state or quality; quickness; celerity.
Also, rapidness
[rap-id-nis] /ˈræp ɪd nɪs/ (Show IPA)
.
Origin
1610-1620
1610-20; < Latin rapiditās. See rapid, -ity
Synonyms
swiftness, fleetness. See speed.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for rapidness

rapidity

n.

1650s, from French rapidité and directly from Latin rapiditatem (nominative rapiditas) "swiftness, rapidity, velocity," from rapidus "hasty, swift, rapid" (see rapid).

Online Etymology Dictionary, © 2010 Douglas Harper
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