noun
the saying of the same thing twice in different words, generally considered to be a fault of style
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The statement 'the sun will rise tomorrow' is a tautology because it is always true.
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Saying 'I am who I am' is kind of a tautology, don't you think?
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It's like saying 'duh, obviously' - total tautology.
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Her constant need for validation is a tautology of her insecurity.