1. The practice or condition of having a single sexual partner during a period of time.
a. The practice or condition of being married to only one person at a time.
b. The practice of marrying only once in a lifetime.
3. Zoology The condition of having only one mate during a breeding season or during the breeding life of a pair.
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.