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English definition of “accumulation”

accumulation

noun [U or C] uk   /əˌkjuː.mjʊˈleɪ.ʃən/ us  
C2 an amount of something that has been collected: Despite this accumulation of evidence, the government persisted in doing nothing. Accumulations of sand can be formed by the action of waves on coastal beaches.
(Definition of accumulation from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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