WordReference Random House Unabridged Dictionary of American English © 2020
de•re•al•i•za•tion  (dē rē′ə lə zāshən),USA pronunciation n. [Psychiatry.]
  1. Psychiatryan alteration in perception leading to the feeling that the reality of the world has been changed or lost.
  • de- + realization, origin, originally in the phrase feeling of derealization, as translation of German Entfremdungsgefühl (Freud) 1940–45

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