Source : Webster's Revised Unabridged Dictionary (1913)

Re-formation \Re`-for*ma"tion\ (r?`f?r*m?"sh?n), n.
   The act of forming anew; a second forming in order; as, the
   reformation of a column of troops into a hollow square.

Source : WordNet®

re-formation
     n : forming again (especially with improvements or removal of
         defects); renewing and reconstituting [syn: {regeneration}]