Lexical Definition

‎τοίνυν‎ toínyn (toy'-noon) then ^G:CONJ
from ‎τοί‎ and ‎νῦν‎

then, therefore.

• truly now, i.e. accordingly

Abbott-Smith

τοί-νυν an inferential particle, [in LXX: Is 3:10 5:13 27:4, Wi 1:11 8:9, a1. * ;]
accordingly, therefore: as in cl., after the first word in a sentence, I Co 9:26; acc to later usage, at the beginning, Lk 20:25, He 13:13.†

Abbott-Smith References

Liddell-Scott-Jones

τοίνυν,

(τοι, νυν) therefore, accordingly, an inferential Particle (never in [Refs 8th c.BC+]; εἰ τ... [Refs 5th c.BC+]; ἂν τ... [Refs 4th c.BC+]; introducing a logical conclusion (less frequently than οὖν), [Refs 5th c.BC+]; φανερὸν τ., δῆλον τ., [Refs 4th c.BC+]; also to introduce a minor premiss, or a particular instance of a general proposition, [Refs 5th c.BC+]

__2 in dialogue, to introduce an answer, well or well then, ἄπειμι τ. [Refs 5th c.BC+]; especially an answer which has been led up to by the same speaker, [Refs 5th c.BC+]; in response to an invitation to speak, [Refs 5th c.BC+]; in expression of approval, especially in phrase καλῶς τ. [Refs 5th c.BC+]; also of disapproval or criticism, ἀπόλοιο τ. [Refs 5th c.BC+]
__3 continuing an argument, well then, [Refs 5th c.BC+]
__3.b resuming the thread of argument or narrative after a break, [Refs 5th c.BC+]
__3.c adding or passing to a fresh item or point, further, moreover, again, [Refs 5th c.BC+]; μὴ τ. μηδέ.. nay, not even.., [Refs 5th c.BC+]nor again, [Refs 5th c.BC+]
__4 sometimes at the beginning of a speech, ἐγὼ μὲν τ..., referring to something present to the minds of the speaker and hearer, now I.., [Refs 5th c.BC+]
__5 with subjunctive of exhortation or imperative, in significations [NT]
__B Position: in early writers τοίνυν is never the first word in a sentence, but this is not uncommon in later authors, as [LXX+NT+2nd c.AD+] F.-R. codex (<τῷ> add. Kaibel); it is usually placed second, but sometimes later, ἥξω φέρουσα συμβολὰς τ. ἅμα [Refs 5th c.BC+] [ῠ regularly, as [Refs 5th c.BC+]: but sometimes ῡ, as [Refs 5th c.BC+]

_{LSJ Scripture Refs: Luke.20.25 ☩ LXX.Isa.3.10 ☩ Luke.20.25 ☩ Heb.13.13}