The Collaborative International Dictionary of English v.0.48:
Accumulation \Ac*cu`mu*la"tion\, n. [L. accumulatio; cf. F.
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. (Law) The concurrence of several titles to the same proof.
Accumulation of energy or power, the storing of energy by
means of weights lifted or masses put in motion;
An accumulation of degrees (Eng. Univ.), the taking of
several together, or at smaller intervals than usual or
than is allowed by the rules.