Source : Webster's Revised Unabridged Dictionary (1913)

Disorientate \Dis*o"ri*en*tate\, v. t.
   To turn away from the east, or (figuratively) from the right
   or the truth. [R.]

Source : WordNet®

disorientate
     v : cause to be lost or disoriented [syn: {disorient}] [ant: {orient}]