Antonyms of adj 400th

1 sense of 400th

Sense 1
four-hundredth, 400th -- (the ordinal number of four hundred in counting order)

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

Similarity of adj 400th

1 sense of 400th

Sense 1
four-hundredth, 400th -- (the ordinal number of four hundred in counting order)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")