Definition

Noun: A dissociative mental condition where an individual's identity fragments, resulting in the apparent presence of two or more distinct and alternating personalities or personality states. This term is often used in general discourse, though the current clinical diagnosis is Dissociative Identity Disorder (DID).

Usage

The term is used to describe the core symptom of a specific psychological disorder. It is typically used in clinical, psychological, and general descriptive contexts. * The character in the novel was written as having a split personality, with one persona being gentle and the other violent. * Popular media often misrepresents split personality as a sudden and dramatic switch between good and evil.

Advanced Usage

• The concept is sometimes used metaphorically in non-clinical language to describe someone who exhibits very contradictory behaviors or opinions.
  • Metaphorical use: "The company has a split personality—it promotes family values but invests in questionable industries."

Variants and Related Words

• Dissociative Identity Disorder (DID): The modern clinical and diagnostic term that has largely replaced "split personality" in professional medical use. It emphasizes the presence of distinct identity states and memory disruption.
• Multiple Personality Disorder (MPD): An older term for the same condition, now superseded by DID.
• Dissociation / Dissociative Disorder: The broader category of mental processes or disorders involving a disconnection between thoughts, identity, consciousness, and memory.

Synonyms

• Dissociative Identity Disorder (clinical synonym)
• Multiple Personality Disorder (dated clinical synonym)

Notes on Meaning

• Clinical vs. Layman's Use: In strict clinical terminology, "split personality" is an outdated and sometimes stigmatizing lay term. The accurate diagnostic label is Dissociative Identity Disorder (DID).
• Not Schizophrenia: It is a common misconception to confuse "split personality" with schizophrenia. Schizophrenia primarily involves psychosis (e.g., hallucinations, delusions), not the presence of multiple distinct personalities.

Noun

1. a relatively rare dissociative disorder in which the usual integrity of the personality breaks down and two or more independent personalities emerge