tr. & intr.v. a·me·lio·rat·ed, a·me·lio·rat·ing, a·me·lio·rates
To make or become better; improve: Volunteers were able to ameliorate conditions in the refugee camp. Conditions are ameliorating.
[Alteration of MELIORATE.]
a·melio·ra·ble (-rə-bəl) adj.
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.