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fallacy

fallacy [ fálləssi ] (plural fallacies)


noun 
Definition:
 
1. mistaken belief or idea: something that is believed to be true but is erroneous

2. logic invalid argument: an argument or reasoning in which the conclusion does not follow from the premises

3. logic logical error in argument: a mistake made in a line of reasoning that invalidates it

4. deceptiveness: the condition of being misleading or deceptive

[15th century. Via Old French< Latin fallacia 'deception' < fallere 'deceive']
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