Entry 1 sense Webster, 1913 Denationalization /dēnˌ-ăshˌ-ən-əl-ĭz-āsh'-ən/ · De·na·tion·al·i·za·tion · IPA /diːˌnæʃ(ə)nəlaɪˈzeɪʃən/ 01 n. The act or process of denationalizing. 1. The act or process of denationalizing.