du·pli·ca·tion (d′plĭ-kāshən, dy′-)
a. The act or procedure of duplicating.
b. The condition of being duplicated.
2. A duplicate; a replica.
a. The occurrence of a repeated section of genetic material in a chromosome.
b. The formation of such a duplication.
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.