Essential Meaning of fallacy
1 : a wrong belief : a false or mistaken idea popular fallacies about medicine It's a fallacy (to believe) that the Earth is flat.
2 : the quality of being false or wrong The fallacy of their ideas about medicine soon became apparent.
Full Definition of fallacy
1a : a false or mistaken idea popular fallacies prone to perpetrate the fallacy of equating threat with capability— C. S. Gray
b : erroneous character : erroneousness The fallacy of their ideas about medicine soon became apparent.
3 : an often plausible argument using false or invalid inference
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