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: Webster's Revised Unabridged Dictionary (1913)