Entry 1 sense Webster, 1913 Accreditation /ə-krěd'ĭ-tāʹshən/ · Ac·cred·i·ta·tion · IPA /əˌkɹɛd.ɪˈteɪ.ʃən/ 01 n. The act of accrediting; as, letters of accreditation. 1. The act of accrediting; as, letters of accreditation.