[ kyoo-myuh-ley-shuh n ]
/ ˌkyu myəˈleɪ ʃən /
the act of cumulating; accumulation.
a heap; mass.
Related formsde·cu·mu·la·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin and History for decumulation
1610s, noun of action from cumulate.
Online Etymology Dictionary, © 2010 Douglas Harper