The Collaborative International Dictionary of English v.0.48:

Prime \Prime\, v. t. [imp. & p. p. Primed; p. pr. & vb. n.
   Priming.] [From Prime, a.]
   1. To apply priming to, as a musket or a cannon; to apply a
      primer to, as a metallic cartridge.
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   2. To lay the first color, coating, or preparation upon (a
      surface), as in painting; as, to prime a canvas, a wall.
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   3. To prepare; to make ready; to instruct beforehand; to
      post; to coach; as, to prime a witness; the boys are
      primed for mischief. [Colloq.] --Thackeray.
      [1913 Webster]

   4. To trim or prune, as trees. [Obs. or Prov. Eng.]
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   5. (Math.) To mark with a prime mark.
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   To prime a pump, to charge a pump with water, in order to
      put it in working condition.
      [1913 Webster]

WordNet (r) 3.0 (2006):

primed
    adj 1: (usually followed by `to' or `for') on the point of or
           strongly disposed; "in no fit state to continue"; "fit to
           drop"; "laughing fit to burst"; "she was fit to scream";
           "primed for a fight"; "we are set to go at any time"
           [syn: fit(p), primed(p), set(p)]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "primed":
   abreast of, accomplished, all ready, all set, armed,
   armed and ready, at concert pitch, au courant, booted and spurred,
   briefed, career, coached, cocked, conversant, educated,
   enlightened, equipped, familiarized, finished, good and ready,
   groomed, in arms, in battle array, in readiness, in the saddle,
   informed, initiate, initiated, instructed, loaded, loaded for bear,
   mature, mobilized, on the mark, planned, posted, practiced,
   prearranged, prepared, prepared and ready, prepped, professional,
   provided, psyched up, ready, ready for anything, ripe, schooled,
   set, skilled, taught, technical, trained, up in arms, up on,
   up-to-date, versed, vigilant, well-prepared, well-versed