Antonyms of adj 80th

1 sense of 80th

Sense 1
eightieth, 80th -- (the ordinal number of eighty in counting order)

INDIRECT (VIA ordinal) -> cardinal -- (being or denoting a numerical quantity but not order; "cardinal numbers")

Similarity of adj 80th

1 sense of 80th

Sense 1
eightieth, 80th -- (the ordinal number of eighty in counting order)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")