trip·li·cate /ˈtrɪplɪkət/
  (a.)三倍的,三重的,三乘的三個一幅中之一,三份中之一,三個一幅
  Trip·li·cate a.  Made thrice as much; threefold; tripled.
  Triplicate ratio Math., the ratio of the cubes of two quantities; thus, the triplicate ratio of a to b is a³: b³.
  Trip·li·cate n. A third thing corresponding to two others of the same kind.
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  triplicate
       n : one of three copies; any of three things that correspond to
           one another exactly
       v : reproduce threefold; "triplicate the letter for the
           committee"