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English word tautology comes from Ancient Greek ταὐτός
ταὐτός (Ancient Greek)
ταυτολογία (Ancient Greek)
tautologia (Late Latin)
tautology (English)
(countable) An expression that features tautology.. (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.. (uncountable) Redundant use of words, a pleonasm, an unnecessary and tedious repetition.