noun Psychiatry.
an alteration in perception leading to the feeling that the reality of the world has been changed or lost.

1940–45; de- + realization, orig. in the phrase feeling of derealization, as translation of German Entfremdungsgefühl (Freud) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

derealization de·re·al·i·za·tion (dē-rē'ə-lĭ-zā'shən)
The feeling that things in one's surroundings are strange, unreal, or somehow altered, as seen in schizophrenia.

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 few months was how long it took before the derealization lasted.
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