Entry 1 sense Webster, 1913 Cumulation /(k?`m?-l?"sh?n)/ · Cu·mu·la·tion · IPA /ˌkjuːm.jəˈleɪ.ʃən/ 01 n. The act of heaping together; a heap. See Accumulation. 1. The act of heaping together; a heap. See Accumulation. See: Accumulation