To transfer a major branch of industry or commerce from private to state ownership or control. The government decided to nationalize the railway system to improve efficiency and service quality.
To make something national in character, scope, or administration. The president pledged to nationalize the education curriculum so that every student would follow the same standards.
Rarely, to grant citizenship or nationality to (a person); to naturalize. Under the new legislation, long-term residents could be nationalized after five years of continuous stay.