Ancient Hellenic Greeks defined Kosmos as "order" or "world order", of everything. It's not only "space" the universe and everything, but the harmonious structure and order of all things.
It also refers to the structure inside your own consciousness. An initiate would "know thyself". To shed their fears, to live their one life reborn with a consciousness more resembling divine (above the line) states instead of suffering (fear mind, which promotes error).
...2. good order, good behaviour, = κοσμιότης Phld.Mus. p.43 K.; discipline, D.18.216; “οὐ κ., ἀλλ᾽ ἀκοσμία” S.Fr.846.
3. form, fashion, “῞ιππου κόσμον ἄεισον δουρατέου” Od.8.492; “κ. ἐπέων ἀπατηλός” Parm.8.52; ἐξηγεομένων . . τὸν κ. αὐτοῦ the fashion of it, Hdt.3.22; κ. τόνδε . . ὁ καταστησάμενος who established this order or from, Id.1.99.
4. of states, order, government, “μεταστῆσαι τὸν κ.” Th. 4.76, cf. 8.48, 67; “μένειν ἐν τῷ ὀλιγαρχικῷ κ.” 8.72, etc.; esp. of the Spartan constitution, Hdt.1.65, Clearch.3: pl., “πόλεων κόσμοι” Pl.Prt. 322c.
IV. Philos., world-order, universe, first in Pythag., acc.to Placit.2.1.1, D.L.8.48 (cf. [Philol.]21), or Parm., acc. to Thphr. ap. D.L.l.c.; “κόσμον τόνδε οὔτε τις θεῶν οὔτε ἀνθρώπων ἐποίησεν, ἀλλ᾽ ἦν ἀεὶ καὶ ἔστιν καὶ ἔσται πῦρ” Heraclit.30; “ὁ καλούμενος ὑπὸ τῶν σοφιστῶν κ.” X.Mem.1.1.11: freq. in Pl., Grg.508a, Ti.27a, al.; “ἡ τοῦ ὅλου σύστασίς ἐστι κ. καὶ οὐρανός” Arist.Cael.280a21, cf. Epicur.Ep. 2p.37U., Chrysipp.Stoic.2.168, etc.; “ὁ κ. ζῷον ἔμψυχον καὶ λογικόν” Posidon. ap. D.L.7.139, cf. Pl.Ti.30b: sts. of the firmament, “γῆς ἁπάσης τῆς ὑπὸ τῷ κόσμῳ κειμένης” Isoc.4.179; “ὁ περὶ τὴν γῆν ὅλος κ.” Arist. Mete.339a20; μετελθεῖν εἰς τὸν ἀέναον κ., of death, OGI56.48 (Canopus, iii B. C.); but also, of earth, as opp. heaven, “ὁ ἐπιχθόνιος κ.” Herm. ap. Stob.1.49.44; or as opp. the underworld, “ὁ ἄνω κ.” Iamb.VP27.123; of any region of the universe, “ὁ μετάρσιος κ.” Herm. ap. Stob.1.49.44; of the sphere whose centre is the earth's centre and radius the straight line joining earth and sun, Archim.Aren.4; of the sphere containing the fixed stars, Pl.Epin.987b: in pl., worlds, coexistent or successive, Anaximand. et alii ap.Placit.2.1.3, cf. Epicur.l.c.; also, of stars, “Νὺξ μεγάλων κ. κτεάτειρα” A.Ag.356 (anap.), cf. Heraclid.et Pythagorei ap.Placit.2.13.15* (= Orph.Fr.22); οἱ ἑπτὰ κ. the Seven planets, Corp.Herm.11.7....
2. metaph., microcosm, “ἄνθρωπος μικρὸς κ.” Democr. 34; “ἄνθρωπος βραχὺς κ.” Ph.2.155; of living beings in general, “τὸ ζῷον οἷον μικρόν τινα κ. εἶναί φασιν ἄνδρες παλαιοί” Gal.UP3.10.
3. in later Gr., = οἰκουμένη, the known or inhabited world, OGI458.40 (9 B.C.), Ep.Rom.1.8, etc.; ὁ τοῦ παντὸς κ. κύριος, of Nero, SIG814.31, cf. IGRom.4.982 (Samos); “ἐὰν τὸν κ. ὅλον κερδήσῃ” Ev.Matt.16.26.
4. men in general, “φανέρωσον σεαυτὸν τῷ κ.” Ev.Jo.7.4, cf. 12.19; esp. of the world as estranged from God by sin, ib.16.20, 17.9, al., 1 Ep.Cor. 1.21, etc.
5. οὗτος ὁ κ. this present world, i.e. earth, opp. heaven, Ev.Jo.13.1; regarded as the kingdom of evil, ὁ ἄρχων τοῦ κ. τούτου ib.12.31.