Entry 1 sense Webster, 1913 Certification /sẽrtˌ-əf-ək-āsh'-ən/ · Cer·ti·fi·ca·tion · IPA /ˌsɝ.tɪ.fɪˈkeɪ.ʃən/ 01 n. The act of certifying. 1. The act of certifying.