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# illusion

«illusion» in Mova's school dictionary: **not: a trick of the eyes or the mind** — its meaning for a pupil, its sense in the lessons and examples, with 2 sentences of Mova's corpora that use it.

### part of speech

noun (an illusion, illusions)

### meaning for a pupil

1) Something that seems real or true but is not: a trick of the eyes or the mind. [tree →](https://md.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://md.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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#m3)

4) A magic trick on a stage. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/#m4)

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

### In the corpora

- [Stage illusions like «sawing a person in half» use special boxes, mirrors and hidden helpers; nobody is hurt.](https://md.mova.elamur.ai/free/en/corpora/school/everyday/279-april-fools-and-magic-tricks/10/)
- [In the Müller-Lyer illusion, two equal lines look different lengths because of the arrow ends; a ruler shows the truth.](https://md.mova.elamur.ai/free/en/corpora/school/everyday/313-kind-jokes-pranks-april-fools-and-adverts/6/)

### Trees and pragmatics

[Every meaning and example of «illusion» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/illusion/), each sentence with its dependency tree and frames.