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multiple personality

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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.
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Origin of multiple personality

First recorded in 1900–05
Also called split personality.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for multiple personality

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 organizationNontechnical name: split personality
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012