D defs.my
Entry 2 senses Webster, 1913

Accumulation

/ək-yo͞omˌ-yəl-āsh'-ən/ · Ac·cu·mu·la·tion · IPA /əˌkjuːm.jəˈleɪ.ʃən/
01 n. The act of accumulating, the state of being accumulated, or that which is accumulated; as, an accumulation of earth, of sand, of evils, of …
  1. 1.
    The act of accumulating, the state of being accumulated, or that which is accumulated; as, an accumulation of earth, of sand, of evils, of wealth, of honors.
  2. 2.
    The concurrence of several titles to the same proof.(Law)
Phrases & compounds
Accumulation of energy [or] power — the storing of energy by means of weights lifted or masses put in motion; electricity stored.
An accumulation of degrees — the taking of several together, or at smaller intervals than usual or than is allowed by the rules.