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A synonym is celerity; a simpler word is speed. In physics, velocityspecifically refers to the measurement of the rate and direction of change in position of an object. It is a vector quantity that specifies both the speed of a body and its direction of motion. The nounvelocity descends from Middle English velocite, from Old French, from Latin vēlōcitās, from vēlōx "fast."

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