The Collaborative International Dictionary of English v.0.48:

Care \Care\ (k[^a]r), n. [AS. caru, cearu; akin to OS. kara
   sorrow, Goth. kara, OHG chara, lament, and perh. to Gr.
   gh^rys voice. Not akin to cure. Cf. Chary.]
   1. A burdensome sense of responsibility; trouble caused by
      onerous duties; anxiety; concern; solicitude.
      [1913 Webster]

            Care keeps his watch in every old man's eye,
            And where care lodges, sleep will never lie. --Shak.
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   2. Charge, oversight, or management, implying responsibility
      for safety and prosperity.
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            The care of all the churches.         --2 Cor. xi.
                                                  28.
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            Him thy care must be to find.         --Milton.
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            Perplexed with a thousand cares.      --Shak.
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   3. Attention or heed; caution; regard; heedfulness;
      watchfulness; as, take care; have a care.
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            I thank thee for thy care and honest pains. --Shak.
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   4. The object of watchful attention or anxiety.
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            Right sorrowfully mourning her bereaved cares.
                                                  --Spenser.

   Syn: Anxiety; solicitude; concern; caution; regard;
        management; direction; oversight. -- Care, Anxiety,
        Solicitude, Concern. These words express mental pain
        in different degress. Care belongs primarily to the
        intellect, and becomes painful from overburdened
        thought. Anxiety denotes a state of distressing
        uneasiness fron the dread of evil. Solicitude expresses
        the same feeling in a diminished degree. Concern is
        opposed to indifference, and implies exercise of anxious
        thought more or less intense. We are careful about the
        means, solicitous and anxious about the end; we are
        solicitous to obtain a good, anxious to avoid an evil.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Care \Care\, v. i. [imp. & p. p. Cared; p. pr. & vb. n.
   Caring.] [AS. cearian. See Care, n.]
   To be anxious or solicitous; to be concerned; to have regard
   or interest; -- sometimes followed by an objective of
   measure.
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         I would not care a pin, if the other three were in.
                                                  --Shak.
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         Master, carest thou not that we perish?  --Mark. iv.
                                                  38.
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   To care for.
   (a) To have under watchful attention; to take care of.
   (b) To have regard or affection for; to like or love.
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             He cared not for the affection of the house.
                                                  --Tennyson.
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WordNet (r) 3.0 (2006):

care
    n 1: the work of providing treatment for or attending to someone
         or something; "no medical care was required"; "the old car
         needs constant attention" [syn: care, attention, aid,
         tending]
    2: judiciousness in avoiding harm or danger; "he exercised
       caution in opening the door"; "he handled the vase with care"
       [syn: caution, precaution, care, forethought]
    3: an anxious feeling; "care had aged him"; "they hushed it up
       out of fear of public reaction" [syn: concern, care,
       fear]
    4: a cause for feeling concern; "his major care was the illness
       of his wife"
    5: attention and management implying responsibility for safety;
       "he is in the care of a bodyguard" [syn: care, charge,
       tutelage, guardianship]
    6: activity involved in maintaining something in good working
       order; "he wrote the manual on car care" [syn: care,
       maintenance, upkeep]
    v 1: feel concern or interest; "I really care about my work"; "I
         don't care"
    2: provide care for; "The nurse was caring for the wounded"
       [syn: care, give care]
    3: prefer or wish to do something; "Do you care to try this
       dish?"; "Would you like to come along to the movies?" [syn:
       wish, care, like]
    4: be in charge of, act on, or dispose of; "I can deal with this
       crew of workers"; "This blender can't handle nuts"; "She
       managed her parents' affairs after they got too old" [syn:
       manage, deal, care, handle]
    5: be concerned with; "I worry about my grades" [syn: worry,
       care]