Tautology

In logic, a tautology is a statement which is true by its own definition. All true statements of logic and mathematics are tautologies. Also, outside logic and mathematics, sometimes means a useless tautology, ie, one that is uninformative (or in colloquial terms, stating the obvious). This definition is imprecise, as all statements are informative in some context.

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In traditional grammar, a tautology is a redundancy due to superfluous qualification, often leading to the schoolboy definition of "saying the same thing twice".

Related Topics:
Traditional grammar - Redundancy

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