Definition of 'speed'

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1. (noun) speed, velocity distance travelled per unit time 2. (noun) speed, swiftness, fastness a rate (usually rapid) at which something happens "the project advanced with gratifying speed" 3. (noun) speed, speeding, hurrying changing location rapidly 4. (noun) focal ratio, f number, stop number, speed the ratio of the focal length to the diameter of a (camera) lens system 5. (noun) amphetamine, pep pill, upper, speed a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression 6. (verb) rush, hotfoot, hasten, hie, speed, race, pelt along, rush along, cannonball along, bucket along, belt along, step on it move fast "He rushed down the hall to receive his guests"; "The cars raced down the street" 7. (verb) accelerate, speed up, speed, quicken move faster "The car accelerated" 8. (verb) travel rapidly, speed, hurry, zip move very fast "The runner zipped past us at breakneck speed" 9. (verb) speed travel at an excessive or illegal velocity "I got a ticket for speeding" 10. (verb) accelerate, speed, speed up cause to move faster "He accelerated the car"
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"speed." Definitions.net. STANDS4 LLC, 2008. 7 October. 2008. http://www.definitions.net/definition/speed