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Definition of accumulation noun from the Oxford Advanced Learner's Dictionary

accumulation

noun
 OPAL W
 
/əˌkjuːmjəˈleɪʃn/
 
/əˌkjuːmjəˈleɪʃn/
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  1.  
    [uncountable] the process of gradually increasing or getting more and more of something over a period of time
    • the accumulation of wealth
    Topics Change, cause and effectc1
  2.  
    [countable] an amount of something that has gradually increased over a period of time
    • an accumulation of toxic chemicals
    Topics Change, cause and effectc1
See accumulation in the Oxford Learner's Dictionary of Academic English
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