accumulation
🇺🇸
/əˌkjuːmjəˈleɪʃn/
🇬🇧
/əˌkjuːmjəˈleɪʃn/
the process of gathering more and more of something over time
The accumulation of snow on the mountain made skiing dangerous.
a large amount of something that has built up over time
The accumulation of dust in the old house caused allergies.