English to English

noun (n)

• an increase in rate of change(noun.attribute)

  Example:
  Modern science caused an acceleration of cultural change.
  

  Antonym:
  deceleration, retardation, slowing
  

  source: wordnet30
• the act of accelerating; increasing the speed(noun.act)

  Synonym:
  quickening, speedup
  Antonym:
  deceleration
  

  source: wordnet30
• (physics) a rate of increase of velocity(noun.time)

  source: wordnet30
• The act of accelerating, or the state of being accelerated; increase of motion or action; as, a falling body moves toward the earth with an acceleration of velocity; -- opposed to retardation.(noun)

  source: webster1913