The Collaborative International Dictionary of English v.0.48:

Ploce \Plo"ce\, n. [L., fr. Gr. ? complication, fr. ? to
   entwine.] (Rhet.)
   A figure in which a word is separated or repeated by way of
   emphasis, so as not only to signify the individual thing
   denoted by it, but also its peculiar attribute or quality;
   as, "His wife's a wife indeed." --Bailey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ploce
    n 1: (rhetoric) repetition to gain special emphasis or extend
         meaning