τρεῖς (treis): all forms
τρεῖς means “three”. Below is its full declension in Ancient Greek.
Positive
| Masculine | Feminine | Neuter | |
|---|---|---|---|
| Nominative | τρεῖς | τρεῖς | τρία |
| Genitive | τριῶν | τριῶν | τριῶν |
| Dative | τρισί | τρισί | τρισί |
| Accusative | τρεῖς | τρεῖς | τρία |
| Vocative | τρεῖς | τρεῖς | τρία |
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.