The Collaborative International Dictionary of English v.0.48:

Meditate \Med"i*tate\, v. t.
   1. To contemplate; to keep the mind fixed upon; to study.
      "Blessed is the man that doth meditate good things."
      --Ecclus. xiv. 20.
      [1913 Webster]

   2. To purpose; to intend; to design; to plan by revolving in
      the mind; as, to meditate a war.
      [1913 Webster]

            I meditate to pass the remainder of life in a state
            of undisturbed repose.                --Washington.
      [1913 Webster]

   Syn: To consider; ponder; weigh; revolve; study.

   Usage: To Meditate, Contemplate, Intend. We meditate a
          design when we are looking out or waiting for the
          means of its accomplishment; we contemplate it when
          the means are at hand, and our decision is nearly or
          quite made. To intend is stronger, implying that we
          have decided to act when an opportunity may offer. A
          general meditates an attack upon the enemy; he
          contemplates or intends undertaking it at the earliest
          convenient season.
          [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Meditate \Med"i*tate\, v. i. [imp. & p. p. Meditated; p. pr. &
   vb. n. Meditating.] [L. meditatus, p. p. of meditari to
   meditate; cf. Gr. ? to learn, E. mind.]
   To keep the mind in a state of contemplation; to dwell on
   anything in thought; to think seriously; to muse; to
   cogitate; to reflect. --Jer. Taylor.
   [1913 Webster]

         In his law doth he meditate day and night. --Ps. i. 2.
   [1913 Webster]

WordNet (r) 3.0 (2006):

meditate
    v 1: reflect deeply on a subject; "I mulled over the events of
         the afternoon"; "philosophers have speculated on the
         question of God for thousands of years"; "The scientist
         must stop to observe and start to excogitate" [syn: chew
         over, think over, meditate, ponder, excogitate,
         contemplate, muse, reflect, mull, mull over,
         ruminate, speculate]
    2: think intently and at length, as for spiritual purposes; "He
       is meditating in his study" [syn: study, meditate,
       contemplate]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "meditate":
   be abstracted, brood, brood over, cerebrate, chaw, chew over,
   chew the cud, cogitate, con over, conceive, consider, contemplate,
   debate, deliberate, deliberate over, deliberate upon, design,
   devise, digest, envisage, envision, frame, have in mind,
   have in view, introspect, meditate upon, mull, mull over, muse,
   muse on, muse over, perpend, plan, play around with, play with,
   ponder, ponder over, reflect, reflect over, reflect upon, revolve,
   ruminate, ruminate over, run over, scheme, speculate, study, think,
   think over, think up, toy with, turn over, weigh