The Collaborative International Dictionary of English v.0.48:

Preconceive \Pre`con*ceive"\, v. t. [imp. & p. p.
   Preconceived; p. pr. & vb. n. Preconceiving.]
   To conceive, or form an opinion of, beforehand; to form a
   previous notion or idea of.
   [1913 Webster]

         In a dead plain the way seemeth the longer, because the
         eye hath preconceived it shorter than the truth.
                                                  --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

preconceive
    v 1: conceive beforehand; "a preconceived notion"