Source : Webster's Revised Unabridged Dictionary (1913)

Versification \Ver`si*fi*ca"tion\, n. [L. versificatio: cf. F.
   versification.]
   The act, art, or practice, of versifying, or making verses;
   the construction of poetry; metrical composition.

Source : WordNet®

versification
     n 1: a metrical adaptation of something (e.g., of a prose text)
     2: the form or metrical composition of a poem
     3: the art or practice of writing verse