Source : Webster's Revised Unabridged Dictionary (1913)

Prosody \Pros"o*dy\, n. [L. prosodia the tone or accent of a
   syllable, Gr. ? a song sung to, or with, an accompanying
   song, the accent accompanying the pronunciation; ? to + ?
   song, ode: cf. F. prosodie. See {Ode}.]
   That part of grammar which treats of the quantity of
   syllables, of accent, and of the laws of versification or
   metrical composition.

Source : WordNet®

prosody
     n 1: the patterns of stress and intonation in a language [syn: {inflection}]
     2: (prosody) a system of versification [syn: {poetic rhythm}, {rhythmic
        pattern}]
     3: the study of poetic meter and the art of versification [syn:
         {metrics}]