Tautology

xkcd comic

tautology: the saying of the same thing twice in different words, generally considered to be a fault of style (e.g., they arrived one after the other in succession).

  • a phrase or expression in which the same thing is said twice in different words.
  • Logic a statement that is true by necessity or by virtue of its logical form.

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(Source: www.xkcd.com)
(Definition from the New Oxford American Dictionary)