[dis-awr-ee-uhn-teyt, -ohr-]
verb (used with object), disorientated, disorientating.

1695–1705; dis-1 + orientate

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

disorientation dis·o·ri·en·ta·tion (dĭs-ôr'ē-ěn-tā'shən)

  1. Loss of one's sense of direction, position, or relationship with one's surroundings.

  2. A temporary or permanent state of confusion regarding place, time, or personal identity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The ground is tilted at odd angles, creating a sense of disorientation.
Another danger the hatchlings face is what's called disorientation.
City dwellers can attest to the disorientation caused by light clutter, or
  groupings of bright lights.
The drug acts as a stimulant and causes hallucinations and disorientation.
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