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tautology

noun

tau·​tol·​o·​gy tȯ-ˈtä-lə-jē How to pronounce tautology (audio)
plural tautologies
1
a
: needless repetition of an idea, statement, or word
Rhetorical repetition, tautology ('always and for ever'), banal metaphor, and short paragraphs are part of the jargon. Philip Howard
b
: an instance of such repetition
The phrase "a beginner who has just started" is a tautology.
2
logic : a statement that is true by virtue of its logical form alone
A logical combination of sentences that is always true, regardless of the truth or falsity of the constituent sentences, is known as a "tautology." Rudy Rucker
… now the objection was raised that the entire theory of natural selection rested on a tautology: "Who survives? The fittest. Who are the fittest? Those that survive." Ernst Mayr

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