v. im·proved, im·prov·ing, im·proves
1. To raise to a more desirable or more excellent quality or condition; make better: Exercise can improve your health.
2. To increase the productivity or value of (land or property): improved the house by adding a bathroom.
1. To become better: Economic conditions are improving.
2. To make beneficial additions or changes: You can improve on the translation of that text.
[Middle English improwen, to enclose land for cultivation, from Anglo-Norman emprouwer, to turn to profit : Old French en-, causative pref. (from Latin in-; see IN-2) + Old French prou, profit (from Late Latin prōde, advantageous; see PROUD).]
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.