distance travelled per unit time
[ Syn: velocity ]
a rate (usually rapid) at which something happens; the project advanced with gratifying speed
changing location rapidly
the ratio of the focal length to the diameter of a (camera) lens system
[ Syn: focal ratio , f number , stop number ]
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
[ Syn: amphetamine , amphetamine , pep pill , pep pill , upper , upper ]
speed (n.)
move fast; He rushed down the hall to receive his guests; The cars raced down the street
[ Syn: rush , hotfoot , hasten , hie , race , pelt along , rush along , cannonball along , bucket along , belt along , step on it ]
move faster; The car accelerated
[ Syn: accelerate , speed up , quicken ]
move very fast; The runner zipped past us at breakneck speed
[ Syn: travel rapidly , hurry , zip ]
travel at an excessive or illegal velocity; I got a ticket for speeding'
cause to move faster; He accelerated the car
[ Syn: accelerate , speed up ]