Antonyms of adj 31

1 sense of 31

Sense 1
thirty-one, 31, xxxi -- (being one more than thirty)

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

Similarity of adj 31

1 sense of 31

Sense 1
thirty-one, 31, xxxi -- (being one more than thirty)
       => cardinal (vs. ordinal) -- (being or denoting a numerical quantity but not order; "cardinal numbers")