logical fallacy

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Noun[edit]

logical fallacy (plural logical fallacies)

  1. A fallacy; a clearly defined error in reasoning used to support or refute an argument, excluding simple unintended mistakes.
    "You can't prove Santa doesn't exist, therefore Santa does exist", is a common logical fallacy.
  2. A formal fallacy.[1]
    A valid syllogism contains three terms; with four it commits the logical fallacy known as quaternio terminorum.

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  1. ^ Encyclopedia Britannica (1911), "Fallacy".