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.
British Dictionary definitions for twenty-one
twenty-one
 
n
another name (esp US) for pontoon

Collins English Dictionary - Complete & Unabridged 10th Edition
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Tile value for twenty

12
12
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