The action of heap, v.; making into a heap; accumulation. Also concrete.

(up-, prefix affix 3d.)

The process of accumulating, heaping, or building up (literal and figurative), esp. of earth or stone (or both) by natural or manual means; the…

The action of forming into a pile or piles; heaping or stacking up; accumulation.

The action of heaping together, or fact of being heaped together; accumulation. Now rare or Obsolete.

A piled heap.

The action or process of laying in heaps, or piling without package: also attributive. Cf. bulk, v.1 5.

The action of forming something into a mass or of piling something up in a heap or heaps; accumulation. Also: a heap, a mass.

The action or process of heaping or piling up, building up; (frequently) the accumulation of earth in embankments or mounds by human or mechanical…

The action of heaping or piling up; e.g. of silt by a river or the sea; also concrete that which is so piled up. Obsolete.

A piling or building up of something; the action of increasing greatly in size or value. Cf. pyramid, v. 1, 4.