Antonyms of adj 500th

1 sense of 500th

Sense 1
five-hundredth, 500th -- (the ordinal number of five hundred in counting order)

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

Similarity of adj 500th

1 sense of 500th

Sense 1
five-hundredth, 500th -- (the ordinal number of five hundred in counting order)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")