οὖνoûn

(adverbially) certainly, or (conjunctionally) accordingly

Greek (New Testament) · G3767

Meanings

wherefore, therefore, then: Matthew 3:10, Luke 3:9, John 8:38, Acts 1:21, Romans 5:9, and elsewhere; in exhortations, Matthew 3:8, Luke 11:35, Acts 3:19, Romans 6:12, and elsewhere; in questions, Matthew 13:28, Mark 15:12, John 8:5, Romans 6:1, and elsewhere; continuing a narrative or resuming it after a digression, Matthew 1:17, Luke 3:18, John 1:22, John 2:18 (and very frequently in this Gospel), Acts 26:22, and elsewhere; ἄρα οὖν (see ἄρα); ἐπεὶ οὖν, Hebrews 2:14; οὖν with participle (= ἐπεὶ οὖν), Acts 2:30, Romans 5:1, and elsewhere; ἐὰν οὖν (where οὖν rather in sense belongs to the apodosis), Matthew 5:23, Luke 4:7, John 6:62, Romans 2:26, and elsewhere; ὡς οὖν, John 4:1, and elsewhere

Appears 497 times in the Bible.

Matthew 1:17 All those listed above include fourteen generations from Abraham to David, fourteen from David to the Babylonian exile, and fourteen from the Babylonian exile to the Messiah.
Matthew 3:8 Prove by the way you live that you have repented of your sins and turned to God.
Matthew 3:10 Even now the ax of God’s judgment is poised, ready to sever the roots of the trees. Yes, every tree that does not produce good fruit will be chopped down and thrown into the fire.
Matthew 5:19 So if you ignore the least commandment and teach others to do the same, you will be called the least in the Kingdom of Heaven. But anyone who obeys God’s laws and teaches them will be called great in the Kingdom of Heaven.
Matthew 5:23 “So if you are presenting a sacrifice at the altar in the Temple and you suddenly remember that someone has something against you,
Matthew 5:48 But you are to be perfect, even as your Father in heaven is perfect.

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Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.