1. Mathematics The expression written below the line in a common fraction that indicates the number of parts into which one whole is divided.
2. A common trait or characteristic.
3. A determining factor or standard: "The tie is probably the single most important denominator of social status for a man in the United States today" (John Molloy).
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.