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fallacy

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The definition of a fallacy is a deceptive or false notion.

(noun)

An example of fallacy is the idea that the sun spins around the earth.

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See fallacy in Webster's New World College Dictionary

noun pl. fallacies

Obsolete deception
aptness to mislead; deceptive or delusive quality: the fallacy of the senses
a false or mistaken idea, opinion, etc.; error
1. an error in reasoning; flaw or defect in argument
2. Logic an argument which does not conform to the rules of logic, esp. one that appears to be sound

Origin: ME fallace < OFr < L fallacia, deception, artifice < fallax (gen. fallacis), deceitful < fallere, to deceive: see fail

See fallacy in American Heritage Dictionary 4

noun pl. fal·la·cies

A false notion.
A statement or an argument based on a false or invalid inference.
Incorrectness of reasoning or belief; erroneousness.
The quality of being deceptive.

Origin:

Origin: Alteration of Middle English fallace

Origin: , from Old French

Origin: , from Latin fallācia, deceit

Origin: , from fallāx, fallāc-, deceitful

Origin: , from fallere, to deceive

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