The Collaborative International Dictionary of English v.0.48:

Possess \Pos*sess"\ (?; 277), v. t. [imp. & p. p. Possessed;
   p. pr. & vb. n. Possessing.] [L. possessus, p. p. of
   possidere to have, possess, from an inseparable prep. (cf.
   Position) + sedere to sit. See Sit.]
   1. To occupy in person; to hold or actually have in one's own
      keeping; to have and to hold.
      [1913 Webster]

            Houses and fields and vineyards shall be possessed
            again in this land.                   --Jer. xxxii.
                                                  15.
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            Yet beauty, though injurious, hath strange power,
            After offense returning, to regain
            Love once possessed.                  --Milton.
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   2. To have the legal title to; to have a just right to; to be
      master of; to own; to have; as, to possess property, an
      estate, a book.
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            I am yours, and all that I possess.   --Shak.
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   3. To obtain occupation or possession of; to accomplish; to
      gain; to seize.
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            How . . . to possess the purpose they desired.
                                                  --Spenser.
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   4. To enter into and influence; to control the will of; to
      fill; to affect; -- said especially of evil spirits,
      passions, etc. "Weakness possesseth me." --Shak.
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            Those which were possessed with devils. --Matt. iv.
                                                  24.
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            For ten inspired, ten thousand are possessed.
                                                  --Roscommon.
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   5. To put in possession; to make the owner or holder of
      property, power, knowledge, etc.; to acquaint; to inform;
      -- followed by of or with before the thing possessed, and
      now commonly used reflexively.
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            I have possessed your grace of what I purpose.
                                                  --Shak.
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            Record a gift . . . of all he dies possessed
            Unto his son.                         --Shak.
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            We possessed our selves of the kingdom of Naples.
                                                  --Addison.
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            To possess our minds with an habitual good
            intention.                            --Addison.
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   Syn: To have; hold; occupy; control; own.

   Usage: Possess, Have. Have is the more general word. To
          possess denotes to have as a property. It usually
          implies more permanence or definiteness of control or
          ownership than is involved in having. A man does not
          possess his wife and children: they are (so to speak)
          part of himself. For the same reason, we have the
          faculties of reason, understanding, will, sound
          judgment, etc.: they are exercises of the mind, not
          possessions.
          [1913 Webster]

WordNet (r) 3.0 (2006):

possessed
    adj 1: influenced or controlled by a powerful force such as a
           strong emotion; "by love possessed" [syn: obsessed,
           possessed(p)]
    2: frenzied as if possessed by a demon; "the soldier was
       completely amuck"; "berserk with grief"; "a berserk worker
       smashing windows" [syn: amuck, amok, berserk,
       demoniac, demoniacal, possessed(p)]

Moby Thesaurus II by Grady Ward, 1.0:

126 Moby Thesaurus words for "possessed":
   abandoned, amok, bedeviled, bellowing, berserk, besotted,
   bewitched, bursting with happiness, by one, carried away,
   collected, composed, consumed, controlled, crazed, delirious,
   demented, demoniac, demonized, devil-ridden, distracted, dominated,
   driven, easy, eaten up, ecstatic, elate, elated, enchanted,
   enraptured, enravished, entranced, exalted, exultant, feral,
   ferocious, fierce, fixated, flushed, frantic, freaked out,
   free and clear, frenzied, fulminating, furious, ghost-haunted,
   ghost-ridden, gripped, hag-ridden, haggard, haunted, held, high,
   hog-wild, howling, hung-up, hysterical, imparadised,
   in a transport, in ecstasies, in fee, in fee simple, in hand,
   in heaven, in hysterics, in paradise, in raptures, in seisin,
   in seventh heaven, in stock, in store, infatuated, intoxicated,
   jubilant, mad, maddened, madding, maniac, monomaniac, monomaniacal,
   obsessed, on cloud nine, on hand, orgasmic, orgiastic, overjoyed,
   overjoyful, own, owned, pixilated, placid, poised, preoccupied,
   prepossessed, pressed, rabid, raging, ramping, ranting, rapt,
   raptured, rapturous, raving, ravished, rhapsodic, roaring,
   running mad, self-possessed, sent, serene, specter-haunted,
   spirit-haunted, spooked, spooky, storming, tranquil, transported,
   uncontrollable, violent, wild, wild-eyed, wild-looking,
   witch-charmed, witch-held, witch-struck, witched