amassment

The act of amassing.

All her energy was devoted to the amassment of a vast fortune.

1654, Walter Charleton, Physiologia Epicuro-Gassendo-Charltoniana, London: Thomas Heath, Book 1, Chapter 2, p. 13, … no can know, whether He [God] created either more Atoms then were requisite to the amassment of this World, or more Worlds then this one:

That which is amassed; a large quantity (of something).

Through the Internet, we have access to an unprecedented amassment of information.

[Phancy, i.e. imagination, is] but an amassment of imaginary conceptions, praejudices, ungrounded opinions, and infinite Impostures;