Source : Webster's Revised Unabridged Dictionary (1913)

Reduplication \Re*du`pli*ca"tion\ (-k?sh?n), n. [Cf. F.
   r['e]duplication, L. reduplicatio repetition.]
   1. The act of doubling, or the state of being doubled.

   2. (Pros.) A figure in which the first word of a verse is the
      same as the last word of the preceding verse.

   3. (Philol.) The doubling of a stem or syllable (more or less
      modified), with the effect of changing the time expressed,
      intensifying the meaning, or making the word more
      imitative; also, the syllable thus added; as, L. tetuli;
      poposci.

Source : WordNet®

reduplication
     n 1: repetition of the final words of a sentence or line at the
          beginning of the next [syn: {anadiplosis}]
     2: the syllable added in a reduplicated word form
     3: a word formed by or containing a repeated syllable or speech
        sound (usually at the beginning of the word)
     4: the act of repeating over and again (or an instance thereof)
        [syn: {reiteration}]