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velocity

ve·loc·i·ty [ və lóssətee ] (plural ve·loc·i·ties)


noun 
Definition:
 
1. speed: the speed at which something moves or happens

2. rate of change in position: the rate of change in the position of an object as it moves in a particular direction

[Mid-16th century. < Latin velocitas-< veloc- "quick, swift"]
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