v. ac·cu·mu·lat·ed, ac·cu·mu·lat·ing, ac·cu·mu·lates
1. To gather or cause to increase; amass: We accumulated enough wood for a fire. Nearly all bank accounts accumulate interest.
2. To be the site for (a gradually increasing mass), especially as a result of disuse or neglect: Those old books are accumulating dust.
To mount or pile up; increase: Snow is accumulating on the roads. See Synonyms at gather.
[Latin accumulāre, accumulāt- : ad-, ad- + cumulāre, to pile up (from cumulus, heap; see keuə- in the Appendix of Indo-European roots).]
ac·cumu·la·ble (-lə-bəl) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.