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twenty-one

[twen-tee-wuhn, twuhn-] /ˈtwɛn tiˈwʌn, ˈtwʌn-/
noun
1.
a cardinal number, 20 plus 1.
2.
a symbol for this number, as 21 or XXI.
3.
a set of this many persons or things.
4.
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.
adjective
5.
amounting to 21 in number.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for 21s'

twenty-one

noun
1.
another name (esp US) for pontoon2 (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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