speed
n 1: distance travelled per unit time [syn: {velocity}]
2: a rate (usually rapid) at which something happens; "the
project advanced with gratifying speed" [syn: {swiftness},
{fastness}]
3: changing location rapidly [syn: {speeding}, {hurrying}, {hastening}]
4: the ratio of the focal length to the diameter of a (camera)
lens system [syn: {focal ratio}, {f number}, {stop number}]
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}]
v 1: step on it; "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}] [ant: {linger}]
2: move faster; "The car accelerated" [syn: {accelerate}, {speed
up}, {quicken}] [ant: {decelerate}]
3: move very fast [syn: {travel rapidly}, {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 up}] [ant: {decelerate}]