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".

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Traditional grammar: In linguistics, traditional grammar is a cover name for the collection of concepts and ideas about the structure of language that Western societies have received from ancient Greek and Roman sources. The term is used to distinguish these ideas from those of contemporary linguistics, which are inten...

Redundancy: Redundancy, in general terms, refers to the quality or state of being redundant, that is: exceeding what is necessary or normal, containing an excess. This can have a negative connotation, superfluous, but also positive, serving as a duplicate for preventing failure of an entire system....