οὖν
I. "really, at all events", used like γοῦν to dismiss a perplexing subject, οὔτ᾽ οὖν ἀγγελίῃς ἔτι πείθομαι, οὔτε θεοπροπίης ἐμπάζομαι Od.; ἐλέχθησαν λόγοι ἄπιστοι μὲν ἐνίοισι Ἑλλήνων, ἐλέχθησαν δ᾽ ὦν but they "really" were spoken, Hdt.; εἴτ᾽ οὖν, εἴτε μὴ γενήσεται whether it shall be "really so", or no, Eur.; εἴτ᾽ οὖν ἀληθὲς εἴτ᾽ οὖν ψεῦδος Plat.; εἰ δ᾽ ἔστιν, ὥσπερ οὖν ἔστι, θεός if he is, as he "surely" is, a god, id=Plat.
2. added to indef. Pronouns and Advs., like Lat. cunque, ὅστις "whoever", ὁστισοῦν "whosoever;" ὅπως "how", ὁπωσοῦν "howsoever;" ἄλλος ὁστισοὖν another, "be he who he may;" so, ὁποιοσοῦν, ὁποσοσοῦν, ὁπωσοῦν, ὁποθενοῦν, etc.
II. to continue a narrative, οἱ δ᾽ ἐπεὶ οὖν ἤγερθεν "so" when they were assembled, Il., etc.:—also to resume after an apodosis, "I say", Hdt., etc.; Hdt. inserts it between the prep. and its Verb, ἐπεὰν δὲ ταῦτα ποιήσωσι, ἀπ᾽ ὦν ἔδωκαν.
III. in Inferences, "then, therefore", Lat. igitur, Hdt., etc.; so, δὴ οὖν, οὖν δή Plat.