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# hallucination

noun (a hallucination, hallucinations); verb hallucinate

«hallucination» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A hallucination is seeing, hearing, feeling or smelling something that is not really there, as if it were real. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#m1)
2. It can be caused by high fever, some illnesses, lack of sleep, some medicines or drugs. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#m2)
3. (computers) An AI hallucination is when a computer program confidently says something false or made up. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#m3)

### In the lessons

In health lessons it explains why very ill or very tired people may see strange things; in computing lessons it is a warning that AI answers must be checked. Phrases: «have hallucinations», «see a hallucination», «AI hallucination».

### Examples

- With a high fever, he had hallucinations of spiders on the wall. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x1)
- A hallucination feels real to the person having it. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x2)
- Lack of sleep can cause hallucinations. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x3)
- The explorer in the desert saw a hallucination of a lake. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x4)
- Some drugs cause dangerous hallucinations. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x5)
- The chatbot gave a hallucination: it invented a book that does not exist. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x6)
- Always check facts, because AI can produce hallucinations. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x7)
- The doctor asked if she had any hallucinations. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/#x8)

### Note

Countable. Say «huh-loo-sih-NAY-shun». A mirage (a fake lake on a hot road) is different: it is a real trick of light that cameras can photograph, while a hallucination is only in the mind. Hallucinations are a health matter; tell an adult.

## On Mova

- [Trees and pragmatics of «hallucination» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/H/hallucination/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«hallucination» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/hallucination.html) on Mova free.