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