The Collaborative International Dictionary of English v.0.48:

Reorganize \Re*or"gan*ize\, Re-organize
\Re-or"gan*ize\(r[-e]*[^o]r"gan*[imac]z), v. t. & i.
   To organize again or anew; as, to reorganize a society or an
   army.

   Syn: regroup.
        [1913 Webster WordNet 1.5]

WordNet (r) 3.0 (2006):

reorganize
    v 1: organize anew; "We must reorganize the company if we don't
         want to go under" [syn: reorganize, reorganise, shake
         up]
    2: organize anew, as after a setback [syn: reorganize,
       reorganise, regroup]