Sense

1. (of time) when, (with indicative, to denote single events) when
2. (with present, of a thing now happening)
3. (rarely with future)

Examples

• Αὕτη ἡ βίβλος γενέσεως οὐρανοῦ καὶ γῆς, ὅτε ἐγένετο. ᾗ ἡμέρᾳ ἐποίησε Κύριος ὁ Θεὸς τὸν οὐρανὸν καὶ τὴν γῆν (Septuagint, Liber Genesis 2:4)
• ὅτε ἐργᾷ τὴν γῆν, καὶ οὐ προσθήσει τὴν ἰσχὺν αὐτῆς δοῦναί σοι. στένων καὶ τρέμων ἔσῃ ἐπὶ τῆς γῆς. (Septuagint, Liber Genesis 4:12)
• Καὶ αὗται αἱ γενέσεις Σήμ. καί ἦν Σὴμ υἱὸς ἑκατὸν ἐτῶν, ὅτε ἐγέννησε τὸν Ἀρφαξάδ, δευτέρου ἔτους μετὰ τὸν κατακλυσμόν. (Septuagint, Liber Genesis 11:10)
• καὶ ἐπορεύθη Ἅβραμ, καθάπερ ἐλάλησεν αὐτῷ Κύριος, καὶ ᾤχετο μετ᾿ αὐτοῦ Λώτ. Ἅβραμ δὲ ἦν ἐτῶν ἑβδομηκονταπέντε, ὅτε ἐξῆλθε ἐκ Χαρράν. (Septuagint, Liber Genesis 12:4)
• καὶ ἐγένετο ἡνίκα εἶδε τὰ ἐνώτια καὶ τὰ ψέλλια ἐν ταῖς χερσὶ τῆς ἀδελφῆς αὐτοῦ καὶ ὅτε ἤκουσε τὰ ρήματα Ρεβέκκας τῆς ἀδελφῆς αὐτοῦ λεγούσης. οὕτω λελάληκέ μοι ὁ ἄνθρωπος, καὶ ἦλθε πρὸς τὸν ἄνθρωπον ἑστηκότος αὐτοῦ ἐπὶ τῶν καμήλων ἐπὶ τῆς πηγῆς (Septuagint, Liber Genesis 24:30)

Source: Ancient Greek entries from Wiktionary