Webster's English Dictionary

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velocity

ve.loc.i.ty \v*-'la:s-*t-e-, -'la:s-te-\ n [MF velocite`, fr. L velocitat-, 
   velocitas, fr. veloc-], velox quick; akin to L vehere to carry - more at 
   WAY 1: quickness of motion : SPEED {the ~ of sound}  2: time rate of linear 
   motion in a given direction  3a: rate of occurrence or action : RAPIDITY  
   3b: rate of turnover {~ of money}