Lexical Definition

‎κόσμιος‎ kósmios (kos'-mee-os) respectable ^G:A
from ‎κόσμος‎ (in its primary sense)

of good behaviour, modest.

• orderly, i.e. decorous

Abbott-Smith

κόσμιος, -ον (in cl. -α, -ον), (< κόσμος), [in LXX: Ec 12:9 (תּקן)*;]
orderly, decent, modest: I Ti 2:9 (WH, mg., -ίως, q.v.) 3:2.†

Abbott-Smith References

Liddell-Scott-Jones

κόσμιος-ιος, α, ον,

(-ος, ον, [Refs 2nd c.AD+], well-ordered, regular, moderate, δαπάνη [Refs 5th c.BC+] c; κόσμιοςιόν ἐστι, with infinitive, is a regular practice, [Refs 5th c.BC+]

__2 of persons, orderly, well-behaved, δίκαιοι καὶ σοφοὶ καὶ κ.[Refs 5th c.BC+] e; of a patient, quiet, [Refs 5th c.BC+]: frequently in Oratt., of honest, orderly citizens, [Refs 5th c.BC+]; modest, ὁμιλία [Refs 5th c.BC+]; τὸ κ. decency, order, [Refs 5th c.BC+] adverb κοσμίως regularly, decently, [Refs 5th c.BC+] c; κ. ἥκομεν as befits us, [Refs 5th c.BC+]: comparative -ιώτερον, βεβιωκέναι [Refs 5th c.BC+]: superlative -ώτατα, τὰς συμφορὰς φέρειν [Refs 5th c.BC+].
__II substantive κόσμιοςιος, ὁ, (κόσμιοςος IV) ={κοσμοπολίτης}, [Refs 1st c.AD+]