The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

         With words premeditated thus he said.    --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Premeditate \Pre*med"i*tate\, v. i.
   To think, consider, deliberate, or revolve in the mind,
   beforehand.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Premeditate \Pre*med"i*tate\, a. [L. praemeditatus, p. p.]
   Premeditated; deliberate. [Archaic] --Bp. Burnet.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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"