quadam
quadam is a Latin form of quidam, meaning “a certain, someone”. It is the ablative singular feminine pronoun.
Found 502 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 4.10.1: [Mosa profluit ex monte Vosego, qui est in finibus Lingonum, et parte quadam ex Rheno recepta, quae appellatur Vacalus insulam efficit Batavorum, in Oceanum influit
Seneca the Elder, Controversiae 7.8.4: IVNI GALLIONIS. Quadam nocte — quid dicam? iam non negare pudet. nox, uinum, error — quid irasceris puella? iam negare non audeo. No …
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.