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rapidity (n.)

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

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Definitions of rapidity from WordNet

rapidity (n.)
a rate that is rapid;
Synonyms: celerity / quickness / rapidness / speediness
From wordnet.princeton.edu