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fallacy

fal·la·cy [ fálləssee ] (plural fal·la·cies)


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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