Meaning of “abnormal” in the English Dictionary

"abnormal" in British English

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abnormaladjective

uk /æbˈnɔː.məl/ us /æbˈnɔːr.məl/

C1 different from what is usual or average, especially in a way that is bad:

Tests revealed some abnormal skin cells.

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abnormally
adverb uk /æbˈnɔː.məl.i/ us /æbˈnɔːr.məl.i/

The success rate was abnormally high.

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

"abnormal" in American English

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abnormaladjective

us /æbˈnɔr·məl, əb-/

not usual or average:

We had an abnormal amount of snow.
He has an abnormal heartbeat.
abnormality
noun [ C/U ] us /ˌæb·nɔrˈmæl·ɪ·t̬i, -nər-/

[ C ] No abnormalities showed up in the blood tests.
abnormally
adverb us /æbˈnɔr·mə·li, əb-/

It was abnormally hot this summer.

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