The Collaborative International Dictionary of English v.0.48:

Karma \Kar"ma\, n. [Skr.]
   1. (Buddhism, Hinduism) One's acts considered as fixing one's
      lot in the future existence.
      [1913 Webster]

   2. (Theos.) The doctrine of fate as the inflexible result of
      cause and effect, especially the principle by which a
      person is rewarded or punished in a subsequent incarnation
      for deeds in the previous incarnation; the theory of
      inevitable consequence.
      [1913 Webster]

   3. One's destiny; fate.
      [PJC]

   4. (Mysticism) The supposed non-physical emanations that a
      person gives off, which may affect other people;
      vibrations.
      [PJC]

WordNet (r) 3.0 (2006):

karma
    n 1: (Hinduism and Buddhism) the effects of a person's actions
         that determine his destiny in his next incarnation