tautology

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English

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Etymology

From Late Latin tautologia, from Ancient Greek ταὐτολογία (tautología) from ταὐτός (tautós, “the same”) + λόγος (lógos, “explanation”), analyzed as tauto- +‎ -logy.

Pronunciation

Noun

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, propositional logic) A statement that is true for all truth values of its propositional variables.
  4. (countable, logic, first-order logic) A statement that is true for all truth values of its Boolean atoms.

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Derived terms

(terms derived from tautology (noun)):

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See also

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