Etymology
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depersonalization (n.)

also depersonalisation, "loss of personality, a treating as though not having a personal identity," 1893, noun of action from depersonalize "regard as not individually personal;" see de- "do the opposite of" +  personalize. Related: Depersonalized; depersonalizing.

updated on August 05, 2018

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Definitions of depersonalization from WordNet

depersonalization (n.)
emotional dissociative disorder in which there is loss of contact with your own personal reality accompanied by feelings of unreality and strangeness;
Synonyms: depersonalisation / depersonalization disorder / depersonalisation disorder / depersonalization neurosis / depersonalisation neurosis
depersonalization (n.)
(existentialism) a loss of personal identity; a feeling of being an anonymous cog in an impersonal social machine;
Synonyms: depersonalisation
depersonalization (n.)
representing a human being as a physical thing deprived of personal qualities or individuality;
Synonyms: depersonalisation / reification
From wordnet.princeton.edu, not affiliated with etymonline.