What does accumulator mean?
An accumulator is a noun denoting something that gathers or stores a resource for later use. Its oldest everyday sense, still current in British English, is a rechargeable electric battery — historically called an 'accumulator' because it accumulated electrical charge. Engineering extends the idea to devices such as hydraulic accumulators, vessels that hold pressurized fluid to meet sudden demand, and thermal accumulators that bank heat. In computing, the accumulator is a fundamental concept: the CPU register where intermediate results of arithmetic operations are built up, one step at a time. More generally, the word can refer to any person or mechanism that collects things over time. The common thread across all these uses is storage through gradual collection — whether of charge, pressure, heat, numbers, or items — making 'accumulator' a precise, technical-sounding choice whenever emphasis falls on the storing rather than the collecting itself.
nounA device or system that accumulates or stores something, such as energy, fluid, or data; especially a rechargeable electric battery (chiefly British) or, in computing and finance, a register that totals successive values.
- A device that stores energy, fluid, or pressure for later use — most commonly a rechargeable electric cell or battery (especially in British usage).
- In computing, a CPU register in which intermediate arithmetic and logic results are accumulated.
- In engineering, a vessel (e.g. hydraulic accumulator) that stores pressurized fluid to smooth out demand.
- One who or that which accumulates; a collector.
"The hydraulic accumulator stores pressure during off-peak hours so the machinery can draw on it when demand spikes."
"The vintage tram drew its power from lead-acid accumulators beneath the floor."
"Each loop iteration adds the running total into the accumulator before moving on."
Standard plural; used when referring to multiple storage devices, registers, or collectors.
"Both accumulators were recharged overnight before the expedition resumed."
Before 'battery' caught on, early electric cars ran on 'accumulators' — and in early computers, the accumulator was the register that did all the arithmetic.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of accumulator
Accumulator derives from the Latin verb accumulare, meaning 'to heap up', formed from ad- ('toward') plus cumulare ('to heap'), which itself comes from cumulus ('heap'). The English verb accumulate appeared in the early 16th century, and the agent noun accumulator followed shortly after, first meaning simply 'one who heaps up'. The technical senses developed in the 19th century: the electrical sense arose with early rechargeable cells that accumulated charge, while the computing sense emerged in the mid-20th century for the arithmetic register at the heart of early processors.
How accumulator is actually used
In British English, 'accumulator' is a traditional term for a rechargeable battery, though 'battery' or 'rechargeable battery' is now more common in everyday speech. In technical fields — computing, hydraulics, finance — 'accumulator' remains standard terminology with sense-specific meanings.
Easily confused with accumulator
An accumulator is the thing (a device or agent) that collects or stores, while accumulation is the process or resulting pile of what has been collected.