The Collaborative International Dictionary
Accumulativeness
Accumulative \Ac*cu"mu*la*tive\, a. Characterized by accumulation; serving to collect or amass; cumulative; additional. -- Ac*cu"mu*la*tive*ly, adv. -- Ac*cu"mu*la*tive*ness, n.
Wiktionary
accumulativeness
n. The state or qualities of being accumulative.