1. One who, or that which, accumulates, collects, or amasses.
2. (Science: mechanics) An apparatus by means of which energy or power can be stored, such as the cylinder or tank for storing water for hydraulic elevators, the secondary or storage battery used for accumulating the energy of electrical charges, etc.
Origin: L. A person who is employed to collect payments (as for rent or taxes).A voltaic battery that stores electric charge.(computer science) a register that has a built-in adder that adds an input number to the contents of the accumulator.Any plants that contribute nutrients to an ecosystem. As plants are the primary producers on the whole, this is usually the case; their decaying organic matter will breakdown into detritus by both herbivores and detrivores which can accummulate the energy contained within the plants that was gained from photosynthesis during the plants lifetime.