Cambridge Dictionary named "hallucinate" its word of the year for 2023, in the sense of an AI producing plausible but false information — a definition added to the dictionary only that year. As ChatGPT spread, the word became, within a single year, the everyday term for talking about AI's limits. The phenomenon itself made repeated headlines, including a US lawyer who cited fictitious cases invented by ChatGPT in a court filing. Dictionary.com chose the same word as its word of the year. Japanese adopted the term as-is, transliterated as "ハルシネーション".