Lexical Definition

‎οἰκία‎ oikía (oy-kee'-ah) home ^G:N-F
from ‎οἶκος‎

home, house(-hold).

• properly, residence (abstractly), but usually (concretely) an abode (literally or figuratively)
• by implication, a family (especially domestics)

Abbott-Smith

οἰκία, -ας, ἡ (< οἶκος), [in LXX chiefly (very freq.) for בַּיִת;]
a house, dwelling: Mt 2:11 7:24-27, Mk 1:29, al.; ἐν οἰκίᾳ (= cl. κατ ̓ οἰκίαν), at home, Lk 8:27; εἰς οἰ., II Jo 10; οἰ, c. gen. pers., usually has the art. (Mt 8:14, al., but cf. οἶκος and v. Bl., § 46, 9); ἡ οἰ. τ. πατρός μου, Jo 14:2. Metaph.,
(a) of the body as the dwelling of the soul: II Co 5:1;
(b) of property (as בַּיִת, Ge 45:18, LXX, τ. ὑπάρχοντα; III Ki 13:8, LXX, οἶκος) = οἶκος (q.v.): Mk 12:40, Lk 20:47;
(c) of the inmates of the dwelling, the household: Mt 12:25; c. gen. pers., Jo 4:53, I Co 16:15.
SYN.: οἶκος, which in Attic law denoted the whole estate, οἰκία, the dwelling only. In cl. poets οἶκος has also the latter sense, but not in prose, except in metaph. usage, where it signifies both property and household. The foregoing distinction is not, however, consistently maintained in late Greek; cf. MM, ii, xvii, and v. Thayer, s.v. οἰκία.

Abbott-Smith References

Liddell-Scott-Jones

οἰκία-α,

Ionic dialect οἰκίαη, Cretan dialect and Locrian dialect ϝοικία, [Refs 5th c.BC+]:—ἡ, building, house, dwelling, [οἰκίαα ἡ δημοσία “IG” 12.94.36; οἰκίαα ἱερά [prev. work]363.24; κατ᾽ οἰκίααν">Refs 5th c.BC+] at home, [οἰκίαας [prev. author] “Lg.” 788a ">Refs 5th c.BC+]; ἔτυχεν ἐπὶ τῆς οἰ. was at home, [Refs 2nd c.AD+] as house to set of apartments or room, τᾶν οἰκιᾶν τιμὰν κομιζέσθω τῶ οἴκω ἑκάστω δύο μνᾶς [Refs 4th c.BC+]

__2 in Attic dialect law, οἶκος was distinguished from οἰκίαα, the former being the property left at a person's death, his estate, the latter the dwelling-house only, as stated by [Refs 5th c.BC+]
__3 distinguished from συνοικία, as one's own apartments from those let out to lodgers, [Refs 4th c.BC+]
__II household, domestic establishment, [Refs 5th c.BC+]; δὔ οἰκίαας ᾤκει, i. e. he kept two establishments, [Refs 4th c.BC+]; more primitive than the πόλις,[Refs]; ὁ ἐπὶ τῆς οἰκίαας the house-steward, [Refs 3rd c.BC+]
__III the household, i. e. inmates of the house, [Refs 5th c.BC+]
__IV house or family from which one is descended, οἰκίαης ἀγαθῆς [Refs 5th c.BC+]; οἰκίαης οὐ φλαυροτέρης[οἰκίαης οὐκ ἐπιφανέος [prev. author] 2.172; τῇ Κύρου οἰκίαῃ συγγενέες [prev. author] 3.2, compare 5th-6th c.BC: Plato Philosophus “Gorgias” 472b; ἐκ τῶν μεγίστων οἰ. 5th c.BC: Eupolis Comicus 117.5, compare 5th-6th c.BC: Andocides Orator 1.126, 5th c.BC: Thucydides Historicus 8.6, etc.; περὶ ὀλίγας οἰ. αἱ.. τραγῳδίαι συντίθενται 4th c.BC: Aristoteles Philosophus “Poetica” 1453a19; ἡ Μακεδόνων οἰ. 2nd c.BC: Polybius Historicus 2.37.7; ἡ βασιλικὴ οἰ. 1st c.BC: Diodorus Siculus Historicus 18.57. ">Refs 5th c.BC+]
__V medical school, ἐξ οἰκίαας Ἡροφίλου [Refs 1st c.AD+]