cumulation

/ˌkjuːmjəˈleɪʃən/
noun
  1. The process of gradually collecting or gathering things together over time.
    • Her knowledge of history grew through the cumulation of facts from many books.
    • The cumulation of snow over several days caused the roof to collapse.
    • The cumulation of small savings eventually paid for their dream vacation.
Antonyms
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