fallacy
fallacy
Latin
“Surprisingly, fallacy began as a verbal trick, not a logical error.”
Latin had fallacia, "deceit or trick," from fallere, "to deceive." In the 1st century BCE, Quintilian used fallacia for rhetorical deception. The word named a practice before it named a logical defect. It centered on misleading speech.
Old French adopted the term as fallace in the 13th century. It appeared in moral and legal writing across northern France. The sense remained "deception" rather than formal logic. The term was familiar in courts and sermons.
Middle English took fallacy in the late 14th century. John Wycliffe's circle used it for deception in religious argument around 1388. By the 16th century, English logic manuals narrowed it toward mistaken reasoning. The word shifted from trick to error.
Modern English fallacy is a mistake in reasoning or an unfounded belief. It can also mean a deceptive argument or a false idea. The path shows a move from rhetoric to logic. It keeps the shadow of deception.
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Today
Fallacy is a noun for a mistaken belief or a defect in reasoning. It also names a deceptive argument that sounds valid but fails.
The modern word keeps the older sense of deception while focusing on logic. It points to how reasoning goes wrong. Error shows its mask.
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