Meaning of “illusion” in the English Dictionary

american-english dictionary
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"illusion" in British English

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illusionnoun

uk /ɪˈluː.ʒən/ us /ɪˈluː.ʒən/

C2 [ C or U ] an idea or belief that is not true:

He had no illusions about his talents as a singer.
I'm under no illusions (= I understand the truth) about the man I married.
My boss is labouring under the illusion that (= wrongly believes that) the project will be completed on time.

C2 [ C ] something that is not really what it seems to be:

A large mirror in a room can create the illusion of space.
The impression of calm in the office is just an illusion.

(Definition of “illusion” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"illusion" in American English

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illusionnoun [ C ]

us /ɪˈlu·ʒən/

an idea or belief that is not true, or something that is not what it seems to be:

We have no illusions about how difficult the job will be.
[ + that clause ] I was under the illusion that trains ran frequently on weekends (= I wrongly believed this).
They managed to create the illusion of space in a tiny apartment.
illusory
adjective us /ɪˈlu·sə·ri, -zə·ri/

Her fears were illusory.

(Definition of “illusion” from the Cambridge Academic Content Dictionary © Cambridge University Press)