n. (pl. -ies) 1 the saying of the same thing twice over in different words, esp. as a fault of style (e.g. arrived one after the other in succession). 2 a statement that is necessarily true. tautologic adj. tautological adj. tautologically adv. tautologist n. tautologize v.intr. (also -ise). tautologous adj.
[ LL tautologia f. Gk (as TAUTO-, -LOGY) ]