1. The act or process of modifying or the condition of being modified.
2. A change or a result produced by modifying: new modifications in the car's design.
a. A change undergone by a word that is borrowed from another language.
b. A phonological change undergone by a word or morpheme when it is used in a construction, as the change of will to 'll in they'll.
modi·fi·ca′to·ry (-kā′tə-rē), modi·fi·ca′tive (-kā′tĭv) 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.