UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ækˌsɛləˈreɪʃən/

US:USA pronuncation: IPAUSA pronuncation: IPA/ækˌsɛləˈreɪʃən/

US:USA pronunciation: respellingUSA pronunciation: respelling(ak sel′ə rāshən)

WordReference Random House Unabridged Dictionary of American English © 2020
ac•cel•er•a•tion  (ak sel′ə rāshən),USA pronunciation n. 
  1. the act of accelerating;
    increase of speed or velocity.
  2. a change in velocity.
  3. Mechanicsthe time rate of change of velocity with respect to magnitude or direction;
    the derivative of velocity with respect to time.
  • Latin accelerātiōn- (stem of accelerātiō). See accelerate, -ion
  • 1525–35

Collins Concise English Dictionary © HarperCollins Publishers::
acceleration /ækˌsɛləˈreɪʃən/ n
  1. the act of accelerating or the state of being accelerated
  2. the rate of increase of speed or the rate of change of velocity
  3. the power to accelerate
WordReference Random House Learner's Dictionary of American English © 2020
ac•cel•er•ate /ækˈsɛləˌreɪt/USA pronunciation   v.,  -at•ed, -at•ing. 
  1. to (cause to) develop, progress, or advance faster: [no object]The unemployment rate accelerated.[+ object]Those policies accelerated unemployment.
  2. to increase the speed (of): [+ object]The driver accelerated the car.[no object]The car accelerated.
  3. to hasten the occurrence of:[+ object]The economic policies accelerated the recession.
ac•cel•er•a•tion /ækˌsɛləˈreɪʃən/USA pronunciation  n. [uncountable]See -celer-.

WordReference Random House Unabridged Dictionary of American English © 2020
ac•cel•er•ate  (ak selə rāt′),USA pronunciation v.,  -at•ed, -at•ing. 
  1. to cause faster or greater activity, development, progress, advancement, etc., in:to accelerate economic growth.
  2. to hasten the occurrence of:to accelerate the fall of a government.
  3. Mechanicsto change the velocity of (a body) or the rate of (motion);
    cause to undergo acceleration.
  4. to reduce the time required for (a course of study) by intensifying the work, eliminating detail, etc.

  1. to move or go faster;
    increase in speed.
  2. to progress or develop faster.
ac•celer•a•ble, adj. 
ac•celer•at′ed•ly, adv. 
  • Latin accelerātus speeded up (past participle of accelerāre), equivalent. to ac- ac- + celer swift + -ātus -ate1
  • 1515–25

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