Skip to definition.
Get the FREE one-click dictionary software for Windows or the iPhone/iPad and Android apps


Noun: speed  speed
  1. Distance travelled per unit time
    - velocity
     
  2. A rate (usually rapid) at which something happens
    "the project advanced with gratifying speed";
    - swiftness, fastness
     
  3. Changing location rapidly
    - speeding, hurrying
     
  4. The ratio of the focal length to the diameter of a (camera) lens system
    - 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
    - amphetamine, pep pill, upper
Verb: speed (sped, also speeded)  speed
  1. Move fast
    "He sped down the hall to receive his guests";
    - rush, hotfoot, hasten, hie [archaic], race, pelt along, rush along, cannonball along, bucket along, belt along, step on it, travel rapidly, hurry, zip
     
  2. Move faster
    "The car sped up";
    - accelerate, speed up, quicken
     
  3. Travel at an excessive or illegal velocity
    "I got a ticket for speeding"
     
  4. Cause to move faster
    "He sped up the car";
    - accelerate, speed up

Derived forms: speeds, sped, speeded, speeding

See also: fast, slow

Type of: alter, change, deepen, drug of abuse, excitant, go, intensify, locomote, modify, motion, move, movement, pace, rate, ratio, stimulant, stimulant drug, street drug, travel

Encyclopedia: Speed, NC