English Reference
noun

accumulation

n.
US /əkˌjumjəˈɫeɪʃən/ UK /ɐkjˌuːmjʊlˈeɪʃən/ ac·cu·mu·la·tion UK spelling accumulations

  1. 01 B2 Upper Intermediate

    the way something grows into a large amount or a pile over time.

    the gradual growth or increase of something through a continuous process of addition.

    Simple

    The accumulation of dust on the old books showed that no one had touched them for years.

    In context

    The slow accumulation of evidence eventually allowed the investigators to build a solid case against the corporation.

    Usage

    Often used with 'of' to describe what is being gathered.

  2. 02 B2 Upper Intermediate

    a pile or a large amount of something that has been collected.

    a mass or quantity of something that has been gathered or piled up.

    Simple

    There was a dangerous accumulation of snow on the roof after the storm.

    In context

    The city struggled to manage the massive accumulation of waste following the week-long strike by sanitation workers.

  3. 03 C1 Advanced Academic Finance

    the way money or wealth grows by adding interest or savings over time.

    the continuous growth of capital through the retention of interest, dividends, or additional savings.

    Simple

    He focused on the accumulation of wealth during his younger years to retire early.

    In context

    The long-term accumulation of capital is essential for firms looking to fund major infrastructure projects without external borrowing.

    Usage

    Commonly used in the context of 'wealth accumulation' or 'capital accumulation'.

    compoundingaccrual
    spendingdivestment
  4. 04 C1 Advanced Technical Finance

    when investors buy a lot of a stock or asset because the price is low.

    the act of investors purchasing a large volume of an asset, typically when prices are perceived as undervalued.

    Simple

    The stock is currently in a phase of accumulation by large banks.

    In context

    Market analysts noted a period of steady accumulation by institutional investors before the sudden price breakout in early March.

  5. 05 C2 Proficiency British EnglishArchaic Education

    an old system where a student could study for two high-level degrees at the same time.

    the historical practice of pursuing two higher academic degrees simultaneously to shorten the total duration of study.

    Simple

    In the nineteenth century, accumulation allowed him to finish his studies much faster.

    In context

    The statutes of the university once permitted the accumulation of degrees, though the practice was eventually abolished to ensure academic rigour.

    Teacher's tip

    This sense is historical and specific to older British university systems; it is rarely encountered in modern contexts.

Collating scientific research, Carson demonstrated that the lack of spring’s dawn chorus in the US was due to the accumulation of DDT, a synthetic pesticide.

Aeon· 17 Aug 2026

Researchers are exploring this strategy to develop a single-dose treatment for hereditary transthyretin amyloidosis , a rare genetic disease caused by the accumulation of misfolded proteins in the heart and nerves.

The Conversation· 6 Aug 2026

From Middle English acumulacyon, from Middle French accumulation and its etymon, Latin accumulātiō, accumulātiōnis. By surface analysis, accumulate + -ion. First attested in the late 15th century. Doublet of accumulatio.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin accumulatio
Level C1 · Advanced
Frequency Frequent
Updated