CUMULATION
pile, heap, mound, agglomerate, cumulation, cumulus
(noun) a collection of objects laid on top of each other
Source: WordNet® 3.1
Noun
cumulation (countable and uncountable, plural cumulations)
Accumulation.
The effect of free trade agreements on the rules of origin in calculating importation tariffs, quotas, etc.
Source: Wiktionary
Cu`mu*la"tion (k`m-l"shn), n. Etym: [Cf. F. cumulation.]
Definition: The act of heaping together; a heap. See Accumulation.
Source: Webster’s Unabridged Dictionary 1913 Edition