Meaning of depersonalisation

(noun) emotional dissociative disorder in which there is loss of contact with your own personal reality accompanied by feelings of unreality and strangeness

(existentialism) a loss of personal identity; a feeling of being an anonymous cog in an impersonal social machine

representing a human being as a physical thing deprived of personal qualities or individuality; "according to Marx, treating labor as a commodity exemplified the reification of the individual"