duplication - definition and synonyms

noun [uncountable] 

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/ˌdjuːplɪˈkeɪʃ(ə)n/
  1. 1
    a situation in which one thing has the same purpose or effect as another and is therefore not necessary

    We’re hoping the new procedures will avoid duplication of effort.

  2. 2
    the process of making an exact copy of something

    printing and duplication costs