Meaning of “fallacy” in the English Dictionary

"fallacy" in American English

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fallacynoun [ C ]

us /ˈfæl·ə·si/

a false belief:

[ + that clause ] It is a common fallacy that only men are good at math.
fallacious
adjective [ not gradable ] us /fəˈleɪ·ʃəs/

a fallacious argument

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