In
rhetoric, a
tautology (from Greek
ταὐτός, "the same" and
λόγος, "word/idea") is a logical argument constructed in such a way, generally by repeating the same concept or assertion using different phrasing or terminology, that the proposition
as stated is logically
irrefutable, while obscuring the lack of evidence or valid reasoning supporting the stated conclusion. (A rhetorical tautology should not be confused with a
tautology in propositional logic.)