Source : Webster's Revised Unabridged Dictionary (1913)

Prepossession \Pre`pos*ses"sion\, n.
   1. Preoccupation; prior possession. --Hammond.

   2. Preoccupation of the mind by an opinion, or impression,
      already formed; preconceived opinion; previous impression;
      bias; -- generally, but not always, used in a favorable
      sense; as, the prepossessions of childhood. ``The
      prejudices and prepossessions of the country.'' --Sir W.
      Scott.

   Syn: Bent; bias; inclination; preoccupancy; prejudgment. See
        {Bent}.

Source : WordNet®

prepossession
     n 1: the condition of being prepossessed; "the king's
          prepossession in my favor is very valuable"
     2: an opinion formed beforehand without adequate evidence; "he
        did not even try to confirm his preconceptions" [syn: {preconception},
         {parti pris}, {preconceived opinion}, {preconceived idea},
         {preconceived notion}]