ἑνός

From LSJ

μοῦνοι Ἑλλήνων δὴ μουνομαχήσαντες τῷ Πέρσῃ → alone of all Greeks we met the Persian singlehandedly, alone of all Greeks having fought singlehanded with the Persians

Source

French (Bailly abrégé)

gén. de εἷς et de ἕν.

Russian (Dvoretsky)

ἑνός: gen. к εἷς.

Greek (Liddell-Scott)

ἑνός: ὁ, λέγεται ὅτι εἶναι = τῷ Λατ. annus, ἔτος, ἐντεῦθεν ἐνιαυτός, δίενος, τρίενος, ὡς τὰ biennis, triennis, κτλ.· πρβλ. ἄφενος.

Greek Monotonic

ἑνός: γεν. του εἷς και ἕν, ενός.