The Collaborative International Dictionary of English v.0.48:

Envisage \En*vis"age\ (?; 48), v. t. [imp. & p. p. Envisaged
   (?; 48); p. pr. & vb. n. Envisaging.] [F. envisager; pref.
   en- (L. in) + visage face, visage. See Visage.]
   To look in the face of; to apprehend; to regard. [R.]
   --Keats.
   [1913 Webster]

         From the very dawn of existence the infant must
         envisage self, and body acting on self.  --McCosh.
   [1913 Webster]

WordNet (r) 3.0 (2006):

envisage
    v 1: 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, ideate,
         envisage]