Lexical Definition

‎οἰκεῖος‎ oikeîos (oy-ki'-os) of one’s household ^G:A
from ‎οἶκος‎

(those) of the (his own) house(-hold).

• domestic, i.e. (as noun), a relative, adherent

Abbott-Smith

οἰκεῖος, -α, -ον (< οἶκος), [in LXX for דּוֹד, שְׁאֵר, etc.; in Is 58:7, οἰ. τοῦ σπέρματος for בָּשָׂר;]
in or of the house (opp. to ξένος, ἀλλότριος);
(a) of things; τὰ οἰ., household affairs or goods;
(b) of persons, of the same family or kin; as subst., οἱ οἰ., kinsmen: I Ti 5:8; c. gen. pers., of the family of: metaph., τ. θεοῦ, Eph 2:19; τ. πίστεως (Lft., in l.), Ga 6:10.†
SYN.: συγγενής, ἴδιος (v. Cremer, 446; Deiss., BS., 123).

Abbott-Smith References

Liddell-Scott-Jones

οἰκεῖος, α, ον,

also ος, ον [Refs 5th c.BC+]; Ionic dialect οἰκήϊος, η, ον: in or of the house, once in [Refs 8th c.BC+]; of or for household affairs, domestic (for οἰκηΐη, see at {οἰκία} II), τὰ οἰ. household affairs, property, [Refs 5th c.BC+]; τὰ οἰ. τὰ αὑτοῦ his household goods, [Refs 5th c.BC+]; opposed to πολιτικά, [Refs 5th c.BC+]; opposed to τὰ τῆς πόλεως, [Refs 5th c.BC+]

__2 Astrology texts, οἰ. ζῴδια domiciliary signs, [Refs 2nd c.AD+]
__II of persons, of the same household, family, or kin, related, ὥς οἱ ἐόντες οἰκήϊοι as being akin to him, [Refs 5th c.BC+]; οἰκεῖον οὕτως οὐδὲν.. ὡς ἀνήρ τε καὶ γυνή so closely akin, [Refs 4th c.BC+]; ἀνὴρ οἰ. kinsman, relative, near friend, [Refs 5th c.BC+]; οἱ οἰ. kinsmen, opposed to οἱ ἀλλότριοι, [Refs 5th c.BC+]; opposed to ὀθνεῖοι, [Refs 5th c.BC+]; οἱ ἑωυτοῦ οἰκηϊότατοι his own nearest kinsmen, [Refs 5th c.BC+]; of the tie itself, κατὰ τὸ οἰ. Ἀτρεῖ because of his relationship to Atreus, [Refs 5th c.BC+]
__II.2 friendly, εἴχομέν ποτε.. τὸν τόπον τοῦτον οἰ. [Refs 5th c.BC+]
__III of things. belonging to one's house or family, one's own (defined as ὅταν ἐφ᾽ αὑτῷ ᾖ ἀπαλλοτριῶσαι [Refs 5th c.BC+]; γῆ, χθών, [Refs 5th c.BC+]; οἰκεῖον, ἢ 'ξ ἄλλου τινό; born in the house, or.. ? [Refs]; αἱ οἰ. πόλεις their own cities, [Refs 5th c.BC+]; ἡ οἰ. (i.e. γῆ), Ionic dialect ἡ οἰκηΐη [Refs 5th c.BC+]; [ἀναθήματα] οἰκήϊα his own property, [Refs]; πόλεμοι οἰ. wars in one's own country, of the Helot war in Laconia, [Refs 5th c.BC+]homegrown, [Refs]
__III.2 ={ἴδιος}, one's own, personal, private, οἰκείων κερδέων εἵνεκα [Refs 6th c.BC+]; μηδὲν -οτέρᾳ τῇ ἀπολαύσει with enjoyment not more our own, [Refs 5th c.BC+]; οἰ. ξύνεσις mother wit, [Refs]; πρὸς οἰκείας χερός by his own hand, [Refs 5th c.BC+]
__III.2.b in Stoic Philos., endeared by nature to all animals, including man, τὸ πρῶτον οἰ. what is earliest endeared, [Refs 3rd c.BC+]
__IV proper to a thing, fitting, suitable, οὔτε.. καλὸν οὐδὲν [οὐδ᾽] οἰκήϊον [Refs 5th c.BC+]
__IV.2 with dative of things, belonging to, conformable to the nature of a thing, προοίμιον οἰ. ἑκάστῳ [Refs 5th c.BC+]
__IV.2.b of persons, with genitive, a student of.., σοφίας [Refs 1st c.BC+]; addicted to, καινοτομίας [Refs 4th c.AD+]
__IV.3 proper, fit, οἰ. κατάγελως fit subject for ridicule, [Refs 4th c.BC+]; οἰ. ὄνομα a word in its proper, literal sense, opposed to metaphor, [Refs 4th c.BC+]
__B adverb οἰκείως has the same senses as the adjective, οἰ φέρε bear it like your own affair, [Refs 5th c.BC+]; διαλέγεσθαι οἰ. τινί converse familiarly with him, [Refs 5th c.BC+]to be on familiar terms, [Refs 5th c.BC+]: comparative -ότερον[Refs 4th c.BC+]; -οτέρως [Refs 4th c.BC+]: superlative -ότατα[Refs 2nd c.BC+]
__B.II properly, naturally, [Refs 5th c.BC+]; opposed to ἀλλοτρίως, [Refs 4th c.BC+]
__B.II.2 affectionately, dutifully, ἔθαψε, περιέστειλεν οἰ. [Refs 5th c.BC+]
__B.II.3 literally, actually, [Refs 4th c.BC+]
__B.II.4 Astrology texts, οἰ. σχηματίζεσθαι, of a planet, to be in its domicile, [Refs 2nd c.AD+]