A way to hold it: something is playing a trick on your perception. What you see, feel, or believe doesn't match what's actually there — and the is convincing enough that you don't notice it from the inside.
From the word’s history
From Latin illūsiō, from illūdere 'to mock, to play a trick on' — in- 'at, upon' plus lūdere 'to play'. The word literally names something playing with you, which is still exactly what an illusion does to the senses.
來自拉丁文 illūsiō，動詞是 illūdere（戲弄、耍弄）：in-（對著）＋ lūdere（玩）。字面就是「拿你來玩」。這個「被戲弄」的畫面到今天都還在——不管是眼睛被光線耍了，還是一個人被自己的想像耍了，illusion 說的都是「有東西在跟你玩」，而你當下並不知道。
Wiktionary: illusion < Old French illusion < Latin illūsiō < illūdere (in- + lūdere 'to play, mock')
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原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
illusionnoun/ɪˈl(j)uːʒ(ə)n/
- 1
human-sciencespsychologysciencesA distortion of sensory perception where real stimuli lead to a false or misleading impression of reality.
- We saw what looked like a tiger among the trees, but it was an illusion caused by the shadows of the branches.
- Using artificial additives, scientists can create the illusion of fruit flavours in food.
- 2
A misapprehension; a belief in something that is in fact not true.
- Jane has this illusion that John is in love with her.
- Now if you feel that you can't go on / Because all of your hope is gone / And your life is filled with much confusion / Until happiness is just an illusion
- 3
A magician’s trick.
- 4
The state of being deceived or misled.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。