Ac*cu"mu*la*tive*ness

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]