Die Quadam
Die Quadam is an ablative of time. Die is an ablative singular feminine of dies (dies, dies), a type five noun.
Quadam is an ablative feminine singular demonstrative pronoun, modifying die. Beware this word...it is sneaky, because the -dam stays the same, and it is the qua that is the declinable part. That qua is from quid, quae, quod, and the nom.masc.sing of quadam is quidam.
Thus, you get: on a certain day or, on a particular day.
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