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WordNet-Online 
 Definitions from WordNet
Noun rapidity has 1 sense 
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| Definitions from the WebRapidityDescription:Rapidity is the quality or state of being swift, quick, or fast. It refers to the speed at which something happens or is done. Sample Sentences:
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| rapid eye movement sleep rapid growth rapid locomotion rapid share rapid thunder rapid transit rapide rapididty rapidity rapidly rapidness rapido rapids rapidually rapier rapin rapine 
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