- a cardinal number, 20 plus 1.
- a symbol for this number, as 21 or XXI.
- a set of this many persons or things.
- Also 21. Also called blackjack. a gambling game at cards, in which the object is to obtain from the dealer cards whose values add up to, or close to, 21 but which do not exceed it.
- amounting to 21 in number.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for twenty-one
Twenty-one of them are Kurdish activist journalists and 30 are women and children.Kobani Still Stands Against ISIS and All Odds. But for How Long?
October 12, 2014
Put that first twenty-one years of life in your David Copperfield pipe and smoke it.Will the Real Jim Palmer Please Stand Up
September 27, 2014
It is now about five p.m. and the temperature is one hundred and twenty-one degrees Fahrenheit.Whatever You Do Someone Will Die. A Short Story About Impossible Choices in Iraq
Nathan Bradley Bethea
August 31, 2014
Twenty-one were stabbed in a Pennsylvania school rampage this week, but all are expected to live—and one even took a selfie.The Best of the Beast, April 7-April 13
The Daily Beast
April 13, 2014
Twenty-one were stabbed in a Pennsylvania school rampage Wednesday, but all are expected to live—and one even took a selfie.Thank God the Murrysville School Attack Wasn’t Guns
April 9, 2014
Some say when he was twenty-one, as soon as his wife presented him with twins, in 1585.The Man Shakespeare
"I'm twenty-one and she's eighteen," hummed the ward under its breath.
The barytone was still singing; but now it was "I'm twenty-one, and she's eighteen."
There are forty-one of these ribs, twenty-one on the upper and twenty on the lower plane.Flying Machines
W.J. Jackman and Thos. H. Russell
All the sales of sheep and lambs are by the "clad score" which contains twenty-one.Camps, Quarters and Casual Places
- another name (esp US) for pontoon 2 (def. 1)