Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

tautological
     adj : repetition of same sense in different words; "`a true fact'
           and `a free gift' are pleonastic expressions"; "the
           phrase `a beginner who has just started' is
           tautological"; "at the risk of being redundant I return
           to my original proposition"- J.B.Conant [syn: {pleonastic},
            {redundant}, {tautologic}]