The Collaborative International Dictionary of English v.0.48:

Outcast \Out"cast`\, a. [Cf. Sw. utkasta to cast out.]
   Cast out; degraded. "Outcast, rejected." --Longfellow.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Outcast \Out"cast`\, n.
   1. One who is cast out or expelled; an exile; one driven from
      home, society, or country; hence, often, a degraded
      person; a vagabond.
      [1913 Webster]

            The Lord . . . gathereth together the outcasts of
            Israel.                               --Ps. cxlvii.
                                                  2.
      [1913 Webster]

   2. A quarrel; a contention. [Scot.] --Jamieson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

outcast
    adj 1: excluded from a society [syn: friendless, outcast]
    n 1: a person who is rejected (from society or home) [syn:
         outcast, castaway, pariah, Ishmael]