Antonyms of adj 40th

1 sense of 40th

Sense 1
fortieth, 40th -- (the ordinal number of forty in counting order)

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

Similarity of adj 40th

1 sense of 40th

Sense 1
fortieth, 40th -- (the ordinal number of forty in counting order)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")