twenty-one, 21, XXI -- (the cardinal number that is the sum of twenty and one)
blackjack, twenty-one, vingt-et-un -- (a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21)
Overview of adj twenty-one
The adj twenty-one has 1 sense
twenty-one, 21, xxi -- (being one more than twenty)
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