In everyday use and in kinematics, the
the rate at which someone or something moves or travels. : the rate at which something happens or is done. : the quality of being quick. Source: ...
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How fast something is moving. Measured as distance traveled per unit of time.
the rate at which someone or something moves or operates ... Meaning, pronunciation, example sentences, and more from Oxford Dictionaries.
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Physics The rate or a measure of the rate of motion, especially: a. Distance traveled divided by the time of travel. b. The limit of this quotient as the time of travel ...