appersonation

[ a-pur-suh-ney-shuh n, uh-pur- ]
/ æˌpɜr səˈneɪ ʃən, əˌpɜr- /

noun Psychiatry.

the unconscious assumption of the personality characteristics of another, usually well known, person.
Also ap·per·son·i·fi·ca·tion [ap-er-son-uh-fi-key-shuh n] /ˌæp ərˌsɒn ə fɪˈkeɪ ʃən/.

Origin of appersonation

1930–35; ap-1 + personation, modeled on German Appersonierung