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What does tautology mean?

Looking for the meaning or definition of the word tautology? Here's what it means.

Noun
  1. (uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition.
  2. (countable) An expression that features tautology.
  3. (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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Examples
Were I to refuse to come at the problem by way of moral self-acceptance, I could easily reduce the cogito to either tautology or antilogy.
Furthermore, they point out that the quantity of money equation is a tautology and cannot possibly support a direction of causality.
I do not think I have ever come across such a fine exercise in tautology in a public document.
Redundancy and tautology are undesirable, and a sign of less than careful writing.
Murrayfield's media centre, the usual home for the tautology and tortuousness of Scottish rugby-speak, was never like this.
Incidentally, white jasmine is a tautology in the Indian context.

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