Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun 21

1 sense of 21

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)

Antonyms of adj 21

1 sense of 21

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 21

1 sense of 21

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")

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