variants: or less commonly multiple personality
Definition of multiple personality disorder
: a personality disorder that is characterized by the presence of two or more distinct and complex identities or personality states each of which becomes dominant and controls behavior from time to time to the exclusion of the others and results from disruption in the integrated functions of consciousness, memory, and identity : dissociative identity disorder
Note: The term dissociative identity disorder is now preferred over multiple personality disorder and multiple personality especially in medical contexts.
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