the act or quality of acting or moving fast; rapidity

the rate at which something moves, is done, or acts

a scalar measure of the rate of movement of a body expressed either as the distance travelled divided by the time taken (average speed) or the rate of change of position with respect to time at a particular point (instantaneous speed). It is measured in metres per second, miles per hour, etc

a rate of rotation, usually expressed in revolutions per unit time

a numerical expression of the sensitivity to light of a particular type of film, paper, or plate

a measure of the ability of a lens to pass light from an object to the image position, determined by the aperture and also the transmitting power of the lens. It increases as the f-number is decreased and vice versa

prosperity or success

to move or go or cause to move or go quickly

to drive (a motor vehicle) at a high speed, esp above legal limits

to help further the success or completion of

to take or be under the influence of amphetamines

to operate or run at a high speed