na·tion·al·ize / ˈnashənəˌlīz/ • v. [tr.] 1. transfer (a major branch of industry or commerce) from private to state ownership or control.2. make distinctively national; give a national character to: in the 13th and 14th centuries church designs were further nationalized.3. [usu. as adj.] (nationalized) naturalize (a foreigner): he is now a nationalized Frenchman.DERIVATIVES: na·tion·al·i·za·tion / ˌnashənəliˈzāshən/ n.na·tion·al·iz·er n.