Definition: rapidity

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Source: WordNet (r) 1.7 

rapidity
     n : a rate that is rapid [syn: celerity, quickness]

Source: Webster's Revised Unabridged Dictionary (1913) 

Rapidity \Ra*pid"i*ty\, n. [L. rapiditas: cf. F. rapidit['e].]
   The quality or state of being rapid; swiftness; celerity;
   velocity; as, the rapidity of growth or improvement.

   Syn: -- Rapidness; haste; speed; celerity; velocity;
        swiftness; fleetness; quickness; agility.