vbl. sb. [f. AMASS v. + -ING1.] The action of heaping up or accumulating. (Mostly gerundial.)
1674. Coles, An Amassing, Coacervatio.
1716. Bp. of Ely, Charge, 7 Aug., 5. There is little need of amassing the Passages together.
1824. Dibdin, Libr. Comp., 279. His ruling passion was amassing state papers.