Fallacy Definition

fălə-sē
fallacies
noun
fallacies
Deception.
Webster's New World
A false or mistaken idea, opinion, etc.; error.
Webster's New World
Aptness to mislead; deceptive or delusive quality.
The fallacy of the senses.
Webster's New World
Incorrectness of reasoning or belief; erroneousness.
American Heritage
An error in reasoning; flaw or defect in argument.
Webster's New World

Other Word Forms of Fallacy

Noun

Singular:
fallacy
Plural:
fallacies

Origin of Fallacy

  • Alteration of Middle English fallace from Old French from Latin fallācia deceit from fallāx fallāc- deceitful from fallere to deceive

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English, from Old French fallace, from Latin fallacia (“deception, deceit”), from fallax (“deceptive, deceitful”), from fallere (“to deceive”).

    From Wiktionary

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