Antonyms of adj 66

1 sense of 66

Sense 1
sixty-six, 66, lxvi -- (being six more than sixty)

INDIRECT (VIA cardinal) -> ordinal -- (being or denoting a numerical order in a series; "ordinal numbers"; "held an ordinal rank of seventh")

Similarity of adj 66

1 sense of 66

Sense 1
sixty-six, 66, lxvi -- (being six more than sixty)
       => cardinal (vs. ordinal) -- (being or denoting a numerical quantity but not order; "cardinal numbers")