Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: fallacia, from fallere 'to deceive'

fallacy

noun
     
fal‧la‧cy plural fallacies
1 [countable] a false idea or belief, especially one that a lot of people believe is true [= misconception]:
It's a common fallacy that a neutered dog will become fat and lazy.
2 [uncountable and countable] formal a weakness in someone's argument or ideas which is caused by a mistake in their thinking

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