εἴσῃ

From LSJ

τὸ ἓν καὶ τὸ ὂν πολλαχῶς λέγεται → the term being and the term one are used in many ways, one and being have various meanings, one and being have many senses

Source

French (Bailly abrégé)

2ᵉ sg. f. Moy. de εἶμι.