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 fallācia deceit from fallāx fallāc- deceitful from fallere to deceive