Meaning of “genius” in the English Dictionary

british dictionary

"genius" in British English

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geniusnoun [ C or U ]

uk /ˈdʒiː.ni.əs/ us /ˈdʒiː.ni.əs/ plural geniuses

C1 very great and rare natural ability or skill, especially in a particular area such as science or art, or a person who has this:

Einstein was a (mathematical) genius.
From the age of three, she showed signs of genius.
It was such a brilliant idea - a real stroke of genius.
evil genius literary

a person who has a strong bad influence over other people:

The film was about an evil genius who wanted to control the world.
have a genius for sth

to be especially skilled at a particular activity:

She has a genius for raising money.

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