4 meanings: 1. an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning 2. unsound or.... Click for more definitions. Definition of fallacy noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The meaning of FALLACY is a false or mistaken idea. How to use fallacy in a sentence. Did you know? I. Definition If logic was a sport, fallacies would be the fouls or errors. Fallacies violate the rules of logical thought, but often seem plausible or even convincing. If you want your arguments to be logical and well-reasoned, you have to make sure that they aren’t full of logical fallacies. A fallacy is an illogical conclusion, but not necessarily a false statement. This is an important distinction, discussed further in section XI. II. A Few Common Fallacies There are thousands and ...

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