Source : Webster's Revised Unabridged Dictionary (1913)

Complicate \Com"pli*cate\, v. t. [imp. & p. p. {Complicated}; p.
   pr. & vb. n. {Complicating}.]
   To fold or twist together; to combine intricately; to make
   complex; to combine or associate so as to make intricate or
   difficult.

         Nor can his complicated sinews fail.     --Young.

         Avarice and luxury very often become one complicated
         principle of action.                     --Addison.

         When the disease is complicated with other diseases.
                                                  --Arbuthnot.

Complicate \Com"pli*cate\, a. [L. complicatus, p. p. of
   complicare to fold together. See {Complex}.]
   1. Composed of two or more parts united; complex;
      complicated; involved.

            How poor, how rich, how abject, how august, How
            complicate, how wonderful is man!     --Young.

   2. (Bot.) Folded together, or upon itself, with the fold
      running lengthwise.

Source : WordNet®

complicate
     v 1: make more complicated; "There was a new development that
          complicated the matter" [syn: {perplex}] [ant: {simplify}]
     2: make more complex, intricate, or richer; "refine a design or
        pattern" [syn: {refine}, {rarify}, {elaborate}]