#1 twenty-one s. [21, xxi] being one more than twenty. wn
#2 twenty-one n. [21, XXI] the cardinal number that is the sum of twenty and one. wn
#3 twenty-one n. [blackjack, 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. wn
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