- The cardinal number equal to 2 × 10. (noun)
- A decade or the numbers from 20 to 29: The children are now in their twenties. The temperature dipped into the twenties. (noun)
- The decade from 20 to 29 in a century. (noun)
- A twenty-dollar bill. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.