v. cu·mu·lat·ed, cu·mu·lat·ing, cu·mu·lates
1. To gather in a heap; accumulate.
2. To combine into one unit; merge.
To become massed.
Having cumulated or having been cumulated; heaped up or amassed.
[Latin cumulāre, cumulāt-, from cumulus, heap; see keuə- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. 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.