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1. Oxford American Dictionary

   velocity

   • IPA[vəˈläsədē]

   美式

   • n.
     the speed of something in a given direction；(in general use) speed

   • noun: velocity, plural noun: velocities

2. • 釋義

   n.

   名詞

   • 1. the speed of something in a given direction the velocities of the emitted particles
   • ▪ (in general use) speed the tank shot backward at an incredible velocity
   • ▪ the rate at which money changes hands within an economy.