Antonyms of adj 45th

1 sense of 45th

Sense 1
forty-fifth, 45th -- (the ordinal number of forty-five in counting order)

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

Similarity of adj 45th

1 sense of 45th

Sense 1
forty-fifth, 45th -- (the ordinal number of forty-five in counting order)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")