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"

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "premeditate":
   calculate, cook up, fix, forethink, frame, frame up, pack,
   pack the deal, plan, plot, prearrange, preconcert, preconsider,
   precontrive, predecide, predesign, predetermine, preorder, prepare,
   preresolve, rig, scheme, set up, sew up, stack the cards,
   work out beforehand