Antonyms of adj 81

1 sense of 81

Sense 1
eighty-one, 81, lxxxi -- (being one more than eighty)

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

Similarity of adj 81

1 sense of 81

Sense 1
eighty-one, 81, lxxxi -- (being one more than eighty)
       => cardinal (vs. ordinal) -- (being or denoting a numerical quantity but not order; "cardinal numbers")