The Collaborative International Dictionary of English v.0.48:

duplication \du`pli*ca"tion\, n. [L. duplicatio: cf. F.
   duplication.]
   1. The act of duplicating, or the state of being duplicated;
      a doubling; a folding over; a fold.
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   2. (Biol.) The act or process of dividing by natural growth
      or spontaneous action; as, the duplication of cartilage
      cells. --Carpenter.
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   duplication of the cube (Math.), the operation of finding a
      cube having a volume which is double that of a given cube.
      [1913 Webster]