5. Velocity
A quickness or speed of motion, action, or operation; rapidity or swiftness: speed or the rapidity of movement; speed imparted to something; a measure of the rate of motion of a body expressed as the rate of change of its position in a particular direction with time. 
It is measured in metres per second, miles per hour, etc: the derivative of position with respect to time; a rate of occurrence or action, the rate of speed with which something happens; rapidity of action or reaction; the rate of turnover (Middle French velocité, from Latin velocitat-, velocitas, from veloc-, velox quick or swift; probably akin to Latin vegēre to enliven – more at wake; related to volāre to fly. See velocipede, -ty: First Known Use: 15th century).
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