multiple personality

noun

, Psychiatry.

1. a rare disorder in which an individual displays several functionally dissociated personalities, each of a complexity comparable to that of a normal individual.

multiple personality

noun

1. psychiatry a mental disorder in which an individual's personality appears to have become separated into two or more distinct personalities, each with its own complex organization Nontechnical namesplit personality

Word History and Origins

Origin of multiple personality¹

First recorded in 1900–05