Source : Webster's Revised Unabridged Dictionary (1913)

Quadruplicate \Quad*ru"pli*cate\, v. t. [imp. & p. p.
   {Quadruplicated}; p. pr. & vb. n. {Quadruplicating}.] [L.
   quadruplicatus, p. p. of quadruplicare, fr. quadruple?
   fourfold. See {Quadruplex}.]
   To make fourfold; to double twice; to quadruple.

Quadruplicate \Quad*ru"pli*cate\, a. [L. quadruplicatus, p. p.]
   1. Fourfold; doubled twice; four times repeated; as, a
      quadruplicate ratio, or a quadruplicate proportion.

   2. (Math.) Raised to the fourth power. [R.]

Source : WordNet®

quadruplicate
     adj : having four units or components; "quadruple rhythm has four
           beats per measure"; "quadruplex wire" [syn: {quadruple},
            {quadruplex}, {fourfold}]
     n : any four copies; any of four things that correspond to one
         another exactly; "it was signed in quadruplicate"
     v : reproduce fourfold; "quadruplicate the bill"