Tautological echo

from The Collaborative International Dictionary of English v.0.48

Tautological \Tau`to*log"ic*al\, a. [Cf. F. tautologique.]
   Involving tautology; having the same signification; as,
   tautological expression. -- {Tau`to*log"ic*al*ly}, adv.
   [1913 Webster]

   {Tautological echo}, an echo that repeats the same sound or
      syllable many times.
      [1913 Webster]