Source : Webster's Revised Unabridged Dictionary (1913)

Ostensibly \Os*ten"si*bly\, adv.
   In an ostensible manner; avowedly; professedly; apparently.
   --Walsh.

         Ostensibly, we were intended to prevent filibustering
         into Texas, but really as a menace to Mexico. --U. S.
                                                  Grant.

Source : WordNet®

ostensibly
     adv : from appearances alone; "irrigation often produces bumper
           crops from apparently desert land"; "the child is
           seemingly healthy but the doctor is concerned"; "had
           been ostensibly frank as to his purpose while really
           concealing it"-Thomas Hardy; "on the face of it the
           problem seems minor" [syn: {apparently}, {seemingly}, {on
           the face of it}]