What is the meaning of Nationalize?

To make into, or to become, a nation.

To bring a private company, or an industry comprising such companies, under the control of a specific government.

To bring a concept such as a political issue or commercial campaign to the attention of the entire country.

To change from having local and regional variation to being national in character and scope.

To make national; to make a nation of; to endow with the character and habits of a nation, or the peculiar sentiments and attachment of citizens of a nation.

Source: wiktionary.org