hallucination

/həˌluːsɪˈneɪʃən/
noun
  1. An experience in which you see, hear, feel, or smell something that is not actually there, often because of a medical condition or drug use.
    • Some medications can cause vivid hallucinations as a side effect.
    • She realized the talking cat was just a hallucination brought on by her fever.
    • After the accident, he had a hallucination of bright lights and strange voices.
  2. A false or mistaken belief or idea that is not based on reality.
    • Thinking you can finish that project in one day is a hallucination.
    • The politician's claim of universal support was a dangerous hallucination.
    • He lived under the hallucination that everyone admired him.
  3. In artificial intelligence, a confident but incorrect response generated by a model, often sounding plausible but being factually wrong.
    • AI hallucinations can be misleading if users don't verify the facts.
    • Researchers are working to reduce hallucinations in language models.
    • The chatbot produced a hallucination when it invented a fake news article.
Antonyms
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