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1. the tendency to change rapidly in mood or temperament
2. a nontechnical term for multiple personality
split personality[′split ‚pər·sə′nal·əd·ē]
The condition in which there is a separation of various components of the normal personality unit, and each component functions as an independent entity.
Split PersonalityHaller, Harry
Jekyll, Dr., and Mr
middle-aged man battles two selves. [Ger. Lit.: Steppenwolf]
Three Faces of Eve, The
. Hyde upright physician reduced to animality by potion. [Br. Lit.: Dr. Jekyll and Mr. Hyde]
story of woman with three distinct personalities. [Am. Cinema: Bawden, 757 (Woodward, Joanne)]