noun

1. One who, or that which, accumulates.

   "He is a great accumulator of bad jokes."

2. A wet-cell storage battery.

   "Looks like it's time to recharge the accumulator again."

3. (betting) A collective bet on successive events, with both stake and winnings being carried forward to accumulate progressively.

4. A system of elastic springs for relieving the strain upon a rope, as in deep-sea dredging.

5. A vessel containing pressurized hot water ready for release as steam.

6. (hydraulics) A container which stores hydraulic power for release, in the form of a pressurized fluid (often suspended within a larger tank of fluid under pressure).

7. A register or variable used for holding the intermediate results of a computation or data transfer.

8. A derivative contract under which the seller commits to sell shares of an underlying security at a certain strike price, which the buyer is obligated to buy.

9. One who takes two higher degrees simultaneously, to reduce their length of study.

10. A one way membership function.