Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun twenty-one

2 senses of twenty-one

Sense 1
twenty-one, 21, XXI -- (the cardinal number that is the sum of twenty and one)
       => large integer -- (an integer equal to or greater than ten)

Sense 2
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)
       => card game, cards -- (a game played with playing cards)

Antonyms of adj twenty-one

1 sense of twenty-one

Sense 1
twenty-one, 21, xxi -- (being one more than twenty)

INDIRECT (VIA cardinal) -> ordinal -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")

Similarity of adj twenty-one

1 sense of twenty-one

Sense 1
twenty-one, 21, xxi -- (being one more than twenty)
       => cardinal (vs. ordinal) -- (being or denoting a numerical quantity but not order; "cardinal numbers")