Denationalization

n. privatization, act of removing from government control or ownership; changing an industry from state or public ownership to private ownership; (Politics) deprivation of national rights (also denationalisation)

Privatization/Privatisation (alternately "denationalization/denationalisation" or "disinvestment") is the transfer of ownership from the public sector (government) to the private sector (business). A transfer in the opposite direction could be referred to the nationalization or municipalization of some property or responsibility.
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Noun
1. changing something from state to private ownership or control
(synonym) denationalisation
(antonym) nationalization, nationalisation, communization, communisation
(hypernym) social control
(derivation) denationalize, denationalise

(n.)
The or process of denationalizing.
  

the converting, by a government, of a nationalized industry or business to private ownership;opposite of nationalization.