du·pli·ca·tion 
/ˌdu:plɪˈkeɪʃən, Brit ˌdju:plɪˈkeɪʃən/ noun
/ˌdu:plɪˈkeɪʃən, Brit ˌdju:plɪˈkeɪʃən/ noun 1 [noncount] : the act or process of copying something
▪ He sent the manuscript out for duplication. 2 : the state of containing copies of something or being a copy of something [noncount] ▪ Please eliminate duplication when combining the lists. [count] ▪ It was a needless duplication of work. [=they did the work twice though they did not need to]
▪ He sent the manuscript out for duplication.
