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.