Hallucination

Podcast 1 · Introduction

Hallucination

A documentary-style narration: origin, meaning, and feel.

Part of speech

noun

Pronunciation

huh-loo-sih-NAY-shun  /həˌluːsɪˈneɪʃ(ə)n/

Definition

A perception of something that is not actually present, experienced without external stimulus; an experience that appears completely real but is created by the mind rather than the senses; in AI contexts, the generation of false or fabricated information presented as true.

Plain meaning

A hallucination is when you perceive something — see, hear, feel, or smell it — that isn't actually there. It can be a symptom of mental illness, drug effects, or neurological conditions. In AI, it means the model confidently states something that is simply false.

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Clinical in psychiatric and neurological contexts. Widely used in everyday speech with varying degrees of precision. The AI hallucination sense is now standard in technology journalism and discussions of large language model limitations.