Antonyms of adj 2d

1 sense of 2d

Sense 1
second, 2nd, 2d -- (coming next after the first in position in space or time or degree or magnitude)

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

Similarity of adj 2d

1 sense of 2d

Sense 1
second, 2nd, 2d -- (coming next after the first in position in space or time or degree or magnitude)
       => ordinal (vs. cardinal) -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")