a. One that closely resembles another.
b. One that has the same functions and characteristics as another; a corresponding person or thing: Their foreign minister is the counterpart of our secretary of state.
2. A duplicate of a legal document.
a. One of two parts that fit and complete each other.
b. One that serves as a complement.
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.