Accumulation

Noun

1. The act of amassing or gathering, as into a pile.
2. The process of growing into a heap or a large amount.

   "an accumulation of earth, of sand, of evils, of wealth, or of honors"

3. A mass of something piled up or collected.
4. The concurrence of several titles to the same proof.
5. The continuous growth of capital by retention of interest or savings.