ac·knowl·edg·ment or ac·knowl·edge·ment (ăk-nŏlĭj-mənt)
1. The act of admitting the existence or truth of something: acknowledgment that the service was poor.
a. Recognition or notice: peace based on acknowledgment of a nation's sovereignty.
b. An expression of thanks or appreciation: included acknowledgments of people who helped in making the book.
3. An answer or response in return for something: sent an acknowledgment of receipt of the letter.
4. Law The formal avowal of an act before a legally empowered officer, such as a judge or notary public, to ensure that the act will be legally recognized.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.