Speed - Definition

n 1: distance travelled per unit time [syn: speed, velocity]
2: a rate (usually rapid) at which something happens; "the
project advanced with gratifying speed" [syn: speed,
swiftness, fastness]
3: changing location rapidly [syn: speed, speeding,
hurrying]
4: the ratio of the focal length to the diameter of a (camera)
lens system [syn: focal ratio, f number, stop number,
speed]
5: a central nervous system stimulant that increases energy and
decreases appetite; used to treat narcolepsy and some forms
of depression [syn: amphetamine, pep pill, upper,
speed]
v 1: move fast; "He rushed down the hall to receive his guests";
"The cars raced down the street" [syn: rush, hotfoot,
hasten, hie, speed, race, pelt along, rush
along, cannonball along, bucket along, belt along,
step on it] [ant: dawdle, linger]
2: move faster; "The car accelerated" [syn: accelerate, speed
up, speed, quicken] [ant: decelerate, retard,
slow, slow down, slow up]
3: move very fast; "The runner zipped past us at breakneck
speed" [syn: travel rapidly, speed, hurry, zip]
4: travel at an excessive or illegal velocity; "I got a ticket
for speeding"
5: cause to move faster; "He accelerated the car" [syn:
accelerate, speed, speed up] [ant: decelerate, slow
down]