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English - English (Wordnet) dictionary (also found in English - Vietnamese, Computing (FOLDOC))
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  • a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
  • the ratio of the focal length to the diameter of a (camera) lens system
  • changing location rapidly
  • a rate (usually rapid) at which something happens
    • the project advanced with gratifying speed
  • distance travelled per unit time
  • cause to move faster
    • He accelerated the car
  • travel at an excessive or illegal velocity
    • I got a ticket for speeding
  • move very fast
    • The runner zipped past us at breakneck speed
  • move faster
    • The car accelerated
  • move fast
    • He rushed down the hall to receive his guests
    • The cars raced down the street
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