<p><strong>Noun:</strong></p><ul><li>plural twenties</li><li>a cardinal number, 10 times 2</li><li>a symbol for this number, as 20 or XX</li><li>a set of this many persons or things</li><li>Informal: a twenty-dollar bill (e.g., "Can you give me two tens for a twenty?")</li><li>twenties: the numbers, years, degrees, or the like, from 20 through 29, as in referring to numbered streets, indicating the years of a lifetime or of a century, or referring to degrees of temperature (e.g., "He lives in the West Twenties." / "She's in her early twenties." / "The temperature must be in the high twenties today.")</li><li>Also 20</li><li>Slang: location; ten-twenty (definition: "What’s your twenty?")</li></ul><p><strong>Adjective:</strong></p><ul><li>amounting to 20 in number.</li></ul>