1610s, "act of heaping together;" 1620s, "a heap, that which is piled up," noun of action from cumulate.
Entries linking to cumulation
cumulate v.
1530s, "gather into a heap or mass" (transitive), from Latin cumulatus "heaped, increased, augmented," past participle of cumulare "to heap," from cumulus "mound, heap" (from suffixed form of PIE root *keue- "to swell"). Related: Cumulated; cumulating; cumulant.