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English definition of “fallacy”

fallacy

noun [C] uk   /ˈfæl.ə.si/ formal us  
an idea that a lot of people think is true but is in fact false: [+ that] It is a common fallacy that women are worse drivers than men.Unreal things and unreality
(Definition of fallacy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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