Sense

1. (with genitive) before, (of place) before, in front of
2. (with verbs of motion)
3. before, in front of, for the purpose of shielding or guarding
4. further on, forward, onward

Examples

• καὶ πᾶν χλωρὸν ἀγροῦ πρὸ τοῦ γενέσθαι ἐπὶ τῆσ γῆσ καὶ πάντα χόρτον ἀγροῦ πρὸ τοῦ ἀνατεῖλαι. οὐ γὰρ ἔβρεξεν ὁ Θεὸσ ἐπὶ τὴν γῆν, καὶ ἄνθρωποσ οὐκ ἦν ἐργάζεσθαι αὐτήν. (Septuagint, Liber Genesis 2:5)
• καὶ εἶπαν. δεῦτε οἰκοδομήσωμεν ἑαυτοῖσ πόλιν καὶ πύργον, οὗ ἔσται ἡ κεφαλὴ ἕωσ τοῦ οὐρανοῦ, καὶ ποιήσωμεν ἑαυτοῖσ ὄνομα πρὸ τοῦ διασπαρῆναι ἡμᾶσ ἐπὶ προσώπου πάσησ τῆσ γῆσ. (Septuagint, Liber Genesis 11:4)
• καὶ ἐπάρασ Λὼτ τοὺσ ὀφθαλμοὺσ αὐτοῦ, ἐπεῖδε πᾶσαν τὴν περίχωρον τοῦ Ἰορδάνου, ὅτι πᾶσα ἦν ποτιζομένη πρὸ τοῦ καταστρέψαι τὸν Θεὸν Σόδομα καὶ Γόμορρα, ὡσ ὁ παράδεισοσ τοῦ Θεοῦ καὶ ὡσ ἡ γῆ Αἰγύπτου, ἕωσ ἐλθεῖν εἰσ Ζόγορα. (Septuagint, Liber Genesis 13:10)
• πρὸ τοῦ κοιμηθῆναι δέ, οἱ ἄνδρεσ τῆσ πόλεωσ οἱ Σοδομῖται περικύκλωσαν τὴν οἰκίαν ἀπὸ νεανίσκου ἕωσ πρεσβυτέρου, ἅπασ ὁ λαὸσ ἅμα. (Septuagint, Liber Genesis 19:4)

Source: Ancient Greek entries from Wiktionary