twenty

1. (in the plural) The numbers twenty (20) to twenty-nine (29).Examples: "She looks like she's in her early twenties, perhaps 21 or 22 years old?"in-plural

2. (colloquial) A banknote with a denomination of 20.Examples: "The waiter’s face lit up when I gave him a twenty."; "The more a shop looks as though it trades in farthings and ha’pennies, the more tenners and twenties you can expect to hand over at the till."colloquial

3. (CB slang) 10-20 (location).Examples: "What’s your twenty, good buddy?"; "What's your twenty? Where's your brain? Checking in to check you out Concerned about your whereabouts"

4. (UK, historical, military) An old English division of infantry.UKhistorical