ac·​cu·​mu·​la·​tor ə-ˈkyü-m(y)ə-ˌlā-tər How to pronounce accumulator (audio)
plural accumulators
: one that accumulates: such as
: a device (as in a hydraulic system) in which a fluid is collected and especially in which it is kept under pressure as a means of storing energy
British : storage battery
: a part (as in a computer) where numbers are totaled or stored
chiefly British : a betting arrangement in which winnings garnered from one bet are immediately used to finance a subsequent bet : parlay

Examples of accumulator in a Sentence

Recent Examples on the Web Patients Come First implores California to recognize the harm caused by copay accumulators and keep patient choice at the center of the discussion. Letters To The Editor, The Mercury News, 14 May 2024 In insurance jargon, this tactic is called a copay accumulator. John Wilkerson, STAT, 17 Jan. 2024 Health plans use tools, called copay accumulators, to keep tabs on whether patients or drug companies were paying the tab for a certain medicine — and don’t count any drug company assistance toward a patient’s deductible or plan maximum. John Wilkerson, STAT, 29 Nov. 2023 In this instance, the focus of the case was on a wonky, but significant tool called copay accumulators, which are used by health plans to blunt the cost of medicines prescribed to their beneficiaries. Ed Silverman, STAT, 2 Oct. 2023 See all Example Sentences for accumulator 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'accumulator.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


accumulate + -or entry 1

First Known Use

circa 1611, in the meaning defined above

Time Traveler
The first known use of accumulator was circa 1611

Dictionary Entries Near accumulator

Cite this Entry

“Accumulator.” Dictionary, Merriam-Webster, Accessed 24 Jul. 2024.

Kids Definition


ac·​cu·​mu·​la·​tor ə-ˈkyü-m(y)ə-ˌlāt-ər How to pronounce accumulator (audio)
: one that accumulates
especially : a part (as in a computer) where numbers are totaled or stored

More from Merriam-Webster on accumulator

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!