hallucination
nounUK /həˌluːsɪˈneɪʃn/
US /həˌluːsɪˈneɪʃn/
A hallucination is when you see or hear something that is not really there.
The tired traveler had a hallucination of water in the desert.
RELATED WORDS
OTHER MEANINGS
2. A false belief that something is real when it is not.
He was sure he saw a ghost, but it was just a hallucination.
3. Something imagined by a computer or AI that is not true.
The chatbot's answer was a hallucination, full of made-up facts.
4. The act of experiencing things that are not there.
Lack of sleep can cause hallucination.