D defs.my
Entry 2 senses Webster, 1913

duplication

/dyo͞opˌ-lək-āsh'-ən/ · du·pli·ca·tion · IPA /d(j)u.plɪˈkeɪ.ʃən/
01 n. The act of duplicating, or the state of being duplicated; a doubling; a folding over; a fold.
  1. 1.
    The act of duplicating, or the state of being duplicated; a doubling; a folding over; a fold.
  2. 2.
    The act or process of dividing by natural growth or spontaneous action; as, the duplication of cartilage cells.(Biol.)
Phrases & compounds
duplication of the cube — the operation of finding a cube having a volume which is double that of a given cube.