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]

Moby Thesaurus II by Grady Ward, 1.0:

99 Moby Thesaurus words for "envisage":
   admit, affront, anticipate, assimilate, behold, brave, breast,
   bring before, bring forward, bring up, call to mind, call up,
   challenge, complete, comprehend, comprise, conceive, confront,
   confront with, conjure up, contain, contemplate, count in, cover,
   dare, defy, dread, embody, embrace, encircle, enclose, encompass,
   encounter, envision, expect, externalize, face, face with, fancy,
   feature, fill, fill in, fill out, forecast, foreglimpse, foresee,
   foretaste, front, grasp, have in mind, have in view, hold, hope,
   image, imagine, include, incorporate, just see, lay before,
   look ahead, look beyond, look forward to, look upon, materialize,
   meditate, meet, meet squarely, number among, objectify, occupy,
   picture, place before, predict, present to, presume, put it to,
   realize, receive, reckon among, reckon in, reckon with, regard,
   represent, see, see ahead, see beforehand, set before, stem,
   summon up, survey, take for granted, take in, take into account,
   take into consideration, take up, think, view, vision, visualize