Entry 1 sense Webster, 1913 Codification /kädˌ-əf-ək-āsh'-ən/ · Co·di·fi·ca·tion · IPA /ˌkɑ.dɪ.fɪˈkeɪ.ʃən/ 01 n. The act or process of codifying or reducing laws to a code. 1. The act or process of codifying or reducing laws to a code.