hallucination

noun3

1. •
   A sensory perception of something that does not exist, often arising from disorder of the nervous system, as in delirium tremens.

   • Hallucinations are always evidence of cerebral derangement and are common phenomena of insanity. — 1871
2. •
   The act of hallucinating; a wandering of the mind; an error, mistake or blunder.

   • This must have been the hallucination of the transcriber. — 1712
3. •
   A confident but incorrect response given by an artificial intelligence; a confabulation.

   • Chatbots even forget that they are a bot and experience "hallucinations", Meta's description for when a bot confidently says something that is not true. — 2022