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Accumulator may refer to:

  • Accumulator (computing), in a CPU, a processor register for storing intermediate results
  • Accumulator (energy), an apparatus for storing energy or power
    • Capacitor, in electrical engineering, also known by the obsolete term accumulator
    • Electrochemical cell, a cell that stores electrical energy, typically used in rechargeable batteries
    • Hydraulic accumulator, an energy storage device using hydraulic fluid under pressure
  • Accumulator (bet), a parlay bet