Definition of rapidity noun from the Oxford Advanced Learner's Dictionary

     

    rapidity

     noun
    noun
    BrE BrE//rəˈpɪdəti//
     
    ; NAmE NAmE//rəˈpɪdəti//
     
    [uncountable]
     
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  1. 1the fact of happening in a short period of time the rapidity of economic growth The disease is spreading with alarming rapidity.
  2. 2the fact of moving or reacting very quickly the rapidity of her heartbeat They could not match the enemy's rapidity of fire.