Source : Webster's Revised Unabridged Dictionary (1913)

Pleonasm \Ple"o*nasm\,, n. [L. pleonasmus, Gr. ?, fr. ? to be
   more than enough, to abound, fr.?, neut. of ?, more, compar.
   of ? much. See {Full}, a., and cf. {Poly-}, {Plus}.] (Rhet.)
   Redundancy of language in speaking or writing; the use of
   more words than are necessary to express the idea; as, I saw
   it with my own eyes.

Source : WordNet®

pleonasm
     n : using more words than necessary; "a tiny little child"

Source : Free On-Line Dictionary of Computing

pleonasm
     
        Redundancy of expression; tautology.
     
        (1995-03-25)