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Changing location rapidly
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A central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
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A rate (usually rapid) at which something happens
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The ratio of the focal length to the diameter of a (camera) lens system
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Distance travelled per unit time
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Move faster
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Cause to move faster
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Move very fast
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Travel at an excessive or illegal velocity
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Move hurridly