disorient

[dis-awr-ee-ent, -ohr-]
verb (used with object)
1.
to cause to lose one's way: The strange streets disoriented him.
2.
to confuse by removing or obscuring something that has guided a person, group, or culture, as customs, moral standards, etc.: Society has been disoriented by changing values.
3.
Psychiatry. to cause to lose perception of time, place, or one's personal identity.

Origin:
1645–55; < French désorienter, equivalent to dés- dis-1 + orienter to orient

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World English Dictionary
disorientate or disorient (dɪsˈɔːrɪənˌteɪt)
 
vb
1.  to cause (someone) to lose his bearings
2.  to perplex; confuse
 
disorient or disorient
 
vb
 
disorien'tation or disorient
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

disorient
1650s, from Fr. désorienter, from dés- "dis-" (see dis-) + orienter (see orient (v.)). Related: Disoriented; disorienting.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They help to orient the reader or sometimes, with intent, to disorient.
Researchers are trying to make a flashlight that would enable police to
  disorient or nauseate somebody they are trying to catch.
Loud music, fog, strobe lights and dark areas are used to disorient guests.
One has to trust him, even while realizing that one of his methods of operation
  is to disorient us as thoroughly as possible.
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