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Definition of 'speed'


  1. distance travelled per unit time
       Synonyms: velocity
  2. a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"
       Synonyms: swiftness fastness
  3. changing location rapidly
       Synonyms: speeding hurrying
  4. the ratio of the focal length to the diameter of a (camera) lens system
       Synonyms: 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
       Synonyms: amphetamine pep pill upper


  1. step on it; "He rushed down the hall to receive his guests"; "The cars raced down the street"
       Synonyms: rush hotfoot hasten hie race pelt along rush along cannonball along bucket along belt along
       Antonyms: linger dawdle
  2. move faster; "The car accelerated"
       Synonyms: accelerate speed up quicken
       Antonyms: decelerate slow slow down slow up retard
  3. travel at an excessive or illegal velocity; "I got a ticket for speeding"
  4. move very fast; "The runner zipped past us at breakneck speed"
       Synonyms: travel rapidly hurry zip
  5. cause to move faster; "He accelerated the car"
       Synonyms: accelerate speed up
       Antonyms: decelerate slow down

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