Entry 1 sense Webster, 1913 Polymerization /pälˌ-ĭm-ẽr-əz-āsh'-ən/ · Pol·y·mer·i·za·tion · IPA /ˌpɒl.ɪ.məɹ.aɪˈzeɪ.ʃən/ 01 n. The act or process of changing to a polymeric form; the condition resulting from such change. 1. The act or process of changing to a polymeric form; the condition resulting from such change.(Chem.)