distance travelled per unit time

[ Syn: velocity ]

a rate (usually rapid) at which something happens; the project advanced with gratifying speed

[ Syn: swiftness , fastness ]

changing location rapidly

[ Syn: speeding , hurrying ]

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 ]

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 ]