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duplication

noun [U]
 
 
/ˌdjuː.plɪˈkeɪ.ʃən/ US  /ˌduː-/

Definition

the act or process of making an exact copy of somethingCopying and copiesForgery
(Definition of duplication noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of duplication