UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˌkjuːmjʊˈleɪʃən/US:USA pronunciation: respellingUSA pronunciation: respelling(ə kyo̅o̅′myə lāshən)

WordReference Random House Unabridged Dictionary of American English © 2020
ac•cu•mu•la•tion  (ə kyo̅o̅′myə lāshən),USA pronunciation n. 
  1. act or state of accumulating;
    state of being accumulated.
  2. that which is accumulated;
    an accumulated amount, number, or mass.
  3. growth by continuous additions, as of interest to principal.
  • Latin accumulātiōn- (stem of accumulātiō). See accumulate, -ion
  • 1480–90

Collins Concise English Dictionary © HarperCollins Publishers::
accumulation /əˌkjuːmjʊˈleɪʃən/ n
  1. the act or process of collecting together or becoming collected
  2. something that has been collected, gathered, heaped, etc
  3. the continuous growth of capital by retention of interest or earnings
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