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Noun: acceleration  ak,se-lu'rey-shun
  1. An increase in the rate of change
    "modern science caused an acceleration of cultural change"
     
  2. The act of accelerating; increasing the speed
    - quickening, speedup
     
  3. (physics) a rate of increase of velocity

Derived forms: accelerations

Type of: alteration, change, hurrying, modification, rate, speed, speeding

Antonym: deceleration

Encyclopedia: Acceleration