[Elamur Dictionary](https://md.dictionary.elamur.ai/free/en/) · [this page in HTML](https://dictionary.elamur.ai/free/en/english/illusion/)

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# illusion

noun (an illusion, illusions)

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

## Everyday

1. Something that seems real or true but is not: a trick of the eyes or the mind. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#m1)
2. An optical illusion: a picture that tricks your eyes, like lines that look different lengths but are the same. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#m2)
3. A false idea or belief: «He was under the illusion that school was cancelled». [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#m3)
4. A magic trick on a stage. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#m4)

### In the lessons

In science: optical illusions show that the brain guesses what we see, and it can be fooled; a mirage in the desert is a real illusion of water. In lessons about tricks and fake news: things can look true but be illusions, so check. Phrases: «optical illusion», «under the illusion that», «the illusion of», «magic illusion».

### Examples

- The two lines look different, but it's an optical illusion — they're the same length. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#x1)
- The magician's illusion made the rabbit vanish. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#x2)
- A mirage is an illusion of water in the hot desert. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#x3)
- He was under the illusion that he would win easily. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#x4)
- The mirror gives the illusion of a bigger room. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#x5)
- Measure the lines with a ruler to beat the illusion. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#x6)

### Note

«An illusion» (it starts with a vowel sound). Do not confuse with «allusion» (a hint or mention of something) or «delusion» (a strong false belief, often a sign of illness). Countable.

## On Mova

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