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.
      [1913 Webster]

   2. (Biol.) The act or process of dividing by natural growth
      or spontaneous action; as, the duplication of cartilage
      cells. --Carpenter.
      [1913 Webster]

   duplication of the cube (Math.), the operation of finding a
      cube having a volume which is double that of a given cube.
      [1913 Webster]

WordNet (r) 3.0 (2006):

duplication
    n 1: a copy that corresponds to an original exactly; "he made a
         duplicate for the files" [syn: duplicate, duplication]
    2: the act of copying or making a duplicate (or duplicates) of
       something; "this kind of duplication is wasteful" [syn:
       duplication, gemination]