1. The cardinal number equal to 2 × 10.
a. A decade or the numbers from 20 to 29: The children are now in their twenties. The temperature dipped into the twenties.
b. often Twenties The decade from 20 to 29 in a century.
3. A twenty-dollar bill.
twenty adj. & pron.
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.
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