1. The act of gathering or amassing, as into a heap or pile: "Little things grew by continual accumulation" (Samuel Johnson).
2. The process of growing into a large amount or heap: the steady accumulation of knowledge.
3. An amount that has accumulated or been accumulated: an accumulation of debt.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.