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accumulation

noun [U or C]
 
 
/əˌkjuː.mjʊˈleɪ.ʃən/

Definition

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.Masses and large amounts of things
(Definition of accumulation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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