οὐκοῦν
1. orig. identical with οὔκουν, but losing all negat. force, "therefore, then, accordingly", Lat. ergo, igitur, itaque, Soph., etc.
2. in questions, "so then?" mostly in irony, Xen.
3. in answers, "why yes, doubtless", Ar., Plat.
An Intermediate Greek-English Lexicon Keyed to Strong's Numbers
οὐκοῦν
1. orig. identical with οὔκουν, but losing all negat. force, "therefore, then, accordingly", Lat. ergo, igitur, itaque, Soph., etc.
2. in questions, "so then?" mostly in irony, Xen.
3. in answers, "why yes, doubtless", Ar., Plat.