τετάρτης (tetartes)
τετάρτης is an Ancient Greek form of τέταρτος, meaning “fourth”. It is the genitive singular feminine adjective.
Found 50 times in the Ancient Greek texts on Socratos.
Where it is used
Diogenes Laertius, Vitae philosophorum 2.6.55: … ν ἤτʼ Αἰσχίνου οὐκ ἀπιθὴς 〈ἲσ〉 γράψαι. . . . Καὶ ὁ μὲν βίος αὐτῷ τοιόσδε. ἤκμαζε δὲ κατὰ τὸ τέταρτον ἔτος τῆς τετάρτης καὶ ἐνενηκοστῆς Ὀλυμπιάδος, καὶ ἀναβέβηκε σὺν Κύρῳ ἐπὶ ἄρχοντος Ξεναινέτου ἑνὶ πρότερον ἔτει τῆς Σωκράτους τε …
All forms of τέταρτος (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.