WordNet (r) 3.0 (2006):

depersonalization
    n 1: emotional dissociative disorder in which there is loss of
         contact with your own personal reality accompanied by
         feelings of unreality and strangeness [syn:
         depersonalization, depersonalisation,
         depersonalization disorder, depersonalisation disorder,
         depersonalization neurosis, depersonalisation neurosis]
    2: (existentialism) a loss of personal identity; a feeling of
       being an anonymous cog in an impersonal social machine [syn:
       depersonalization, depersonalisation]
    3: 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" [syn: depersonalization,
       depersonalisation, reification]