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EnglishEdit

EtymologyEdit

From Late Latin tautologia, from Ancient Greek ταυτολογία (tautología) from ταὐτός (tautós, the same) + λόγος (lógos, explanation)

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NounEdit

tautology (countable and uncountable, plural tautologies)

  1. (uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition.
    It is tautology to say, "Forward Planning".
  2. (countable) An expression that features tautology.
    The expression "raze to the ground" is a tautology, since the word "raze" includes the notion "to the ground".
    • 1946, Bertrand Russell, History of Western Philosophy:
      Pure mathematics consists of tautologies, analogous to ‘men are men’, but usually more complicated.
  3. (countable, logic) In propositional logic: a statement that is true for all truth values of its propositional variables. In first-order logic: a statement that is true for all truth values of its Boolean atoms.

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