Source : Webster's Revised Unabridged Dictionary (1913)

Denationalization \De*na`tion*al*i*za"tion\, n. [Cf. F.
   d['e]nationalisation.]
   The or process of denationalizing.

Source : WordNet®

denationalization
     n : changing something from state to private ownership or
         control [syn: {denationalisation}] [ant: {nationalization}]