Source : Webster's Revised Unabridged Dictionary (1913)

Alienation \Al`ien*a"tion\, n. [F. ali['e]nation, L. alienatio,
   fr. alienare, fr. alienare. See {Alienate}.]
   1. The act of alienating, or the state of being alienated.

   2. (Law) A transfer of title, or a legal conveyance of
      property to another.

   3. A withdrawing or estrangement, as of the affections.

            The alienation of his heart from the king. --Bacon.

   4. Mental alienation; derangement of the mental faculties;
      insanity; as, alienation of mind.

   Syn: Insanity; lunacy; madness; derangement; aberration;
        mania; delirium; frenzy; dementia; monomania. See
        {Insanity}.

Source : WordNet®

alienation
     n 1: the feeling of being alienated from other people [syn: {disaffection},
           {estrangement}]
     2: separation resulting from hostility [syn: {estrangement}]
     3: (law) the voluntary and absolute transfer of title and
        possession of real property from one person to another;
        "the power of alienation is an essential ingredient of
        ownership"
     4: the action of alienating; the action of causing to become
        unfriendly; "his behavior alienated the other students"