WordReference Random House Unabridged Dictionary of American English © 2020
de•re•al•i•za•tion (dē rē′ə lə zā′shən),USA pronunciation n. [Psychiatry.]
- 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