Dictionary entry

οὖν

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

οὖν,

particle expressing consequence or simple sequence (never standing first in a sentence),

wherefore, therefore, then: Mt 3:10, Lk 3:9, Jo 8:38, Ac 1:21, Ro 5:9, al.; in exhortations, Mt 3:8, Lk 11:35, Ac 3:19, Ro 6:12, al.; in questions, Mt 13:28, Mk 15:12, Jo 8:[5], Ro 6:1, al.; continuing a narrative or resuming it after a digression, Mt 1:17, Lk 3:18, Jo 1:222:18 (and very freq. in this Gospel), Ac 26:22, al.; ἄρα οὖν (v.s. ἄρα); ἐπεὶ οὖν, He 2:14; οὖν c. ptcp. (= ἐπεὶ οὖν), Ac 2:30, Ro 5:1, al.; ἐὰν οὖν (where οὖν rather in sense belongs to the apodosis), Mt 5:23, Lk 4:7, Jo 6:62, Ro 2:26, al.; ὡς οὖν, Jo 4:1, al.