accumulation

noun

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

   “an accumulation of earth, of sand, of evils, of wealth, or of honors”

   “At the lowest point, a short length of tunnel was driven alongside the up line, with a cross passage, to serve as a sump and pump house for dealing with any accumulation of water.”

   “Accumulation of tiny, positional blunders adds up to a ruptured Kingside.”

3. (countable, uncountable)A mass of something piled up or collected.

   “After such an accumulation of mistakes in the treatment of lexical items, it comes as no surprise that the section on word formation on p. 133 is equally poor.”

4. (countable, uncountable)The concurrence of several titles to the same proof.
5. (countable, uncountable)The continuous growth of capital by retention of interest or savings.
6. (countable, uncountable)The action of investors buying an asset from other investors when the price of the asset is low.
7. (UK, historical, uncountable)The practice of taking two higher degrees simultaneously, to reduce the length of study.