[1] : The Collaborative International Dictionary of English v.0.48

ideat \ide"at\, ideate \ide"ate\, n. ll. ideatum. see
   idea. metaph.
   the actual existence supposed to correspond with an idea; the
   correlate in real existence to the idea as a thought or
   existence.
   1913 webster
see also:
idea 

[2] : The Collaborative International Dictionary of English v.0.48

ideate \ide"ate\, v. t.
   1. to form in idea; to fancy. r.
      1913 webster

            the ideated man . . . as he stood in the intellect
            of god.                               --sir t.
                                                  browne.
      1913 webster

   2. to apprehend in thought so as to fix and hold in the mind;
      to memorize. r.
      1913 webster

[3] : WordNet (r) 2.0

ideate
     v : form a mental image of something that is not present or that
         is not the case; "can you conceive of him as the
         president?" syn: imagine, conceive of, envisage
see also:
imagine conceive of envisage 

Ideate >> I Words
Ideate, definition of term: Ideate
ideate_pag1.html