noun
The division or separation of something into two or more parts or elements.
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The patient was diagnosed with a split personality disorder, also known as dissociative identity disorder.
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Sometimes I feel like I have a split personality, with one side being serious and the other side being carefree.
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My friend can be so unpredictable, it's like she has a total split personality.
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His actions at work and at home are so different, it's like he has a split personality.