Source : Webster's Revised Unabridged Dictionary (1913)

Premeditate \Pre*med"i*tate\, v. t. [imp. & p. p. {Premeditated}
   (-t[=a]`t?d); p. pr. & vb. n. {Premeditating}.] [L.
   praemeditatus, p. p. of praemeditari; prae before + meditari
   to meditate. See {Meditate}.]
   To think on, and revolve in the mind, beforehand; to contrive
   and design previously; as, to premeditate robbery.

         With words premeditated thus he said.    --Dryden.

Premeditate \Pre*med"i*tate\, v. i.
   To think, consider, deliberate, or revolve in the mind,
   beforehand.

Premeditate \Pre*med"i*tate\, a. [L. praemeditatus, p. p.]
   Premeditated; deliberate. [Archaic] --Bp. Burnet.

Source : WordNet®

premeditate
     v 1: consider, ponder, or plan (an action) beforehand;
          "premeditated murder"
     2: think or reflect beforehand or in advance; "I rarely
        premeditate, which is a mistake"