Entry 2 senses · 2 variants Webster, 1913 Disillusion /dĭsˌ-ĭl-o͞ozh'-ən/ · Dis·il·lu·sion · IPA /dɪs.ɪˈluːʒən/ n. v. t. 01 n. The act or process of freeing from an illusion, or the state of being freed therefrom. 1. The act or process of freeing from an illusion, or the state of being freed therefrom. 02 v. t. To free from an illusion; to disillusionize. 1. To free from an illusion; to disillusionize.