Lexical Definition

‎θεῖος‎ theîos (thi'-os) divine ^G:A
from ‎θεός‎

divine, godhead.

• godlike (neuter as noun, divinity)

Abbott-Smith

θεῖος, -εία, -εῖον (< θεός), [in LXX: Ex 31:3 35:31, Jb 27:3 33:4, Pr 2:17 (אֵל, אֱלוֹהַּ, אֱלֹהִים), Si 6:35, II Ma3, III Mac1, IV Mac25*;]
divine: δύναμις, II Pe 1:3; φύσις (for parallel in π., v. MM, Exp., xv), II Pe 1:4; τὸ θ., the Deity (so in cl.; of God, in Philo and FlJ), Ac 17:29.†

Abbott-Smith References

Liddell-Scott-Jones

θεῖος, α, ον:

__Alate Epic dialect θέειος [Refs 5th c.AD+]; θεήϊος [Refs 2nd c.BC+]; late Aeolic dialect θήϊος [Refs]; Laconian dialect σεῖος (see. below 1.3): comparative and superlative θειότερος, -ότατος, frequently in [Refs 5th c.BC+]: (θεός):
__1 of or from the gods, divine, γένος [Refs 8th c.BC+]; Ὄνειρος[Refs 5th c.BC+], of a dust-storm, [Refs 5th c.BC+]; θ. τινὶ μοίρᾳ by divine intervention, [Refs 5th c.BC+]; θ. κἀπόνῳ τύχῃ, of an easy death, [Refs 5th c.BC+]; φύσις θ. [NT]; appointed of God, βασιλῆες [Refs 8th c.BC+]; σκῆπτρον given by God, [Refs 5th c.BC+]
__2 belonging or sacred to a god, holy, ἀγών, χορός, [Refs 8th c.BC+]; under divine protection, πύργος, δόμος, [Refs 8th c.BC+]; of heralds and bards, [Refs 8th c.BC+]; so perhaps, of kings,[Refs]
__3 morethan human, of heroes, Ὀδυσσεύς [Refs 8th c.BC+]; ὦ θεῖε (in the mouth of a Spartan) [Refs 5th c.BC+]
__3.b of things, excellent, θεῖον ποτόν [Refs 8th c.BC+]; θ. πρήγματα marvellous things, [Refs 5th c.BC+]
__4 = Latin divinus (or sacer), [Refs 2nd c.AD+]; θ. ὅρκος oath by the Emperor, [Refs 4th c.AD+]; θειότατος, of living Emperors, [Refs 1st c.BC+]
__4.b = Latin divus, of deified Emperors, θ. Σεβαστός Edict.Claud. cited in [Refs 1st c.AD+]
__II as substantive, θεῖον, τό, the Divinity, [Refs 5th c.BC+]; ἡμαρτηκότα εἰς τὸ θ. [Refs 5th c.BC+]
__II.2 in an abstract sense, divinity, κεκοινώνηκε.. τοῦ θ. [Refs]; ἢ μόνον μετέχει τοῦ θ..., ἢ μάλιστα [ἄνθρωπος] [Refs 4th c.BC+]; κατὰ θεῖον or κατά τι θ., [Refs 5th c.BC+]
__II.3 θεῖα, τά, the acts of the gods, course of providence, [Refs 5th c.BC+]
__II.3.b matters of religion, ἔρρει τὰ θ. religion is no more, [Refs 5th c.BC+]
__II.3.c inquiries concerning the divine, [Refs 5th c.BC+]; τὰ φανερὰ τῶν θείων, i.e. the heavenly bodies, [Refs 4th c.BC+]
__III adverb θείως by divine providence, θ. πως [Refs 5th c.BC+]; θειοτέρως by special providence, [Refs 5th c.BC+]
__III.2 divinely, excellently, εὖ γε καὶ θ. [Refs 5th c.BC+]

_{LSJ Scripture Refs: 2Pet.1.4}