Definition of split personality in English English dictionary
the supposed psychological syndrome in which two or more personalities exist in the same person
If you say that someone has a split personality, you mean that their moods can change so much that they seem to have two separate personalities. a condition in which someone has two very different ways of behaving
personal disorder in which someone believes that they are two different and independent individuals
a relatively rare dissociative disorder in which the usual integrity of the personality breaks down and two or more independent personalities emerge