Entry 1 sense Webster, 1913 Nationalization /năshˌ-ən-əl-əz-āsh'-ən/ · Na·tion·al·i·za·tion · IPA /nˌæʃənələzˈeɪʃən/ 01 n. The act of nationalizing, or the state of being nationalized. 1. The act of nationalizing, or the state of being nationalized.