The definition of a fallacy is a deceptive or false notion.
An example of fallacy is the idea that the sun spins around the earth.
- Obs. deception
- aptness to mislead; deceptive or delusive quality: the fallacy of the senses
- a false or mistaken idea, opinion, etc.; error
- an error in reasoning; flaw or defect in argument
- Logic an argument which does not conform to the rules of logic, esp. one that appears to be sound
Origin of fallacyMiddle English fallace ; from Old French ; from Classical Latin fallacia, deception, artifice ; from fallax (gen. fallacis), deceitful ; from fallere, to deceive: see fail
- 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 of fallacyAlteration of Middle English fallace, from Old French, from Latin fallacia, deceit, from fallax, fallac-, deceitful, from fallere, to deceive.