The Collaborative International Dictionary of English v.0.48:

Train \Train\, v. t. [imp. & p. p. Trained; p. pr. & vb. n.
   Training.] [OF. trahiner, tra["i]ner,F. tra[^i]ner, LL.
   trahinare, trainare, fr. L. trahere to draw. See Trail.]
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   1. To draw along; to trail; to drag.
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            In hollow cube
            Training his devilish enginery.       --Milton.
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   2. To draw by persuasion, artifice, or the like; to attract
      by stratagem; to entice; to allure. [Obs.]
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            If but a dozen French
            Were there in arms, they would be as a call
            To train ten thousand English to their side. --Shak.
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            O, train me not, sweet mermaid, with thy note.
                                                  --Shak.
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            This feast, I'll gage my life,
            Is but a plot to train you to your ruin. --Ford.
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   3. To teach and form by practice; to educate; to exercise; to
      discipline; as, to train the militia to the manual
      exercise; to train soldiers to the use of arms.
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            Our trained bands, which are the trustiest and most
            proper strength of a free nation.     --Milton.
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            The warrior horse here bred he's taught to train.
                                                  --Dryden.
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   4. To break, tame, and accustom to draw, as oxen.
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   5. (Hort.) To lead or direct, and form to a wall or espalier;
      to form to a proper shape, by bending, lopping, or
      pruning; as, to train young trees.
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            He trained the young branches to the right hand or
            to the left.                          --Jeffrey.
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   6. (Mining) To trace, as a lode or any mineral appearance, to
      its head.
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   To train a gun (Mil. & Naut.), to point it at some object
      either forward or else abaft the beam, that is, not
      directly on the side. --Totten.

   To train, or To train up, to educate; to teach; to form
      by instruction or practice; to bring up.
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            Train up a child in the way he should go; and when
            he is old, he will not depart from it. --Prov. xxii.
                                                  6.
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            The first Christians were, by great hardships,
            trained up for glory.                 --Tillotson.
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WordNet (r) 3.0 (2006):

trained
    adj 1: shaped or conditioned or disciplined by training; often
           used as a combining form; "a trained mind"; "trained
           pigeons"; "well-trained servants" [ant: untrained]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "trained":
   abreast of, acclimated, acclimatized, accommodated, accomplished,
   accustomed, adapted, adjusted, at concert pitch, au courant,
   briefed, career, case-hardened, coached, conditioned, conversant,
   educated, enlightened, experienced, familiarized, finished,
   hardened, informed, initiate, initiated, instructed, inured,
   naturalized, orientated, oriented, posted, practiced, prepared,
   primed, professional, run-in, schooled, seasoned, skilled, taught,
   technical, up on, up-to-date, used to, versed, well-versed, wont,
   wonted