Lexical Definition

‎οἴομαι‎ oíomai (oy'-om-ahee) to suppose ^G:V
middle voice apparently from ‎οἷος‎

suppose, think.

• to make like (oneself), i.e. imagine (be of the opinion)

Abbott-Smith

οἴομαι, οἶμαι, [in LXX for הִנֵּה, Ge 37:7, al.;]
to suppose, expect, imagine; c. acc. et inf., Jo 21:25; c. inf., Phl 1:17*; seq. ὅτι, Ja 1:7.†
SYN.: v.s. ἡγέομαι.

Abbott-Smith References

Liddell-Scott-Jones

οἴομαι,

in [Refs 8th c.BC+] always un contraction ὀΐομαι (except οἴομαι [Refs 8th c.BC+], see below:—the shortened form οἶμαι is the one chiefly used in Trag., οἴομαι only in [Refs 5th c.BC+]; but οἴομαι is frequently in [Refs 5th c.BC+] does not use either form; in Attic dialect Prose codices vary, but οἶμαι prevails, and was exclusively used in parenthesis (see. infr. IV): imperfect ᾠόμην [Refs 5th c.BC+]: future οἰήσομαι [Refs 5th c.BC+]:—Epic dialect aorist ὠϊσάμην (see. below): aorist ὠΐσθην [Refs 8th c.BC+]; participle ὀϊσθείς [Refs 8th c.BC+]; Attic dialect and Ionic dialect aorist ᾠήθην [Refs 5th c.BC+]; but rare in Comedy texts and Trag., οἰηθῇς [Refs 5th c.BC+]; also aorist infinitive οἰήσασθαι [Refs 4th c.BC+]:—active, Epic dialect present ὀΐω and οἴω, but only in 1st pers. singular (see. below); Laconian dialect οἰῶ [Refs 5th c.BC+]. [In the un contraction forms, [Refs 8th c.BC+] can be supported by ὀϊσσάμενος [Refs 4th c.BC+]; active present ὀΐω has ῑ when it stands at the end of a line, also in [Refs 8th c.BC+]; but ῐ in [Refs 8th c.BC+].]:—forebode, presage, with accusative, κῆρας ὀϊομένῳ [Refs 8th c.BC+]; expect, ἐελδομένοισι μάλ᾽ ἡμῖν, οὐδ᾽ ἔτ᾽ ὀϊομένοισι [Refs]; suspect, ἤ τι ὀϊσάμενος, ἢ καὶ θεὸς ὣς ἐκέλευσεν [Refs]; fear, κατὰ θυμὸν ὀΐσατο, μή ἑ λαβοῦσα οὐλὴν ἀμφράσσαιτο [Refs] thou art ever suspecting, [Refs 8th c.BC+] you can guess how it would have happened, [Refs]future infinitive, ὀΐομαι ἄνδρα χολωσέμεν [Refs 8th c.BC+]; τὸ καὶ τελέεσθαι ὀΐω [Refs]: with accusative et present infinitive, referring to present time, οὐδέ τι θυμῷ ὠΐσθη δόλον εἶναι [Refs 8th c.BC+]: with accusative et aorist infinitive, referring to past time, τῇ δ᾽ ὀΐω κατανεῦσαι [Refs 8th c.BC+]subjunctive of the infinitive must frequently be supplied from the context, διωκέμεναι γὰρ ὀΐω I fear [they] are pursuing me, [Refs 8th c.BC+]infinitive alone, when both Verbs have the same subject, as κιχήσεσθαι δέ δ᾽ ὀΐω I think I shall catch you, [Refs]; mean, intend, with future infinitive, οὐ γὰρ ἔγωγ᾽ ἔτι σοὶ πείσεσθαι ὀΐω [Refs 8th c.BC+]: with present infinitive, οὐ γὰρ ὀΐω ἀνδρῶν δυσμενέων ἑκὰς ἱστάμενος πολεμίζειν [Refs 8th c.BC+]

__II impersonal, only [Refs 8th c.BC+] there comes a boding into my heart.
__III think, suppose, believe, frequently in [Refs 8th c.BC+]; οἶμαι γάρ νιν ἱκετεύσειν (ἱκετεῦσαι codices) [Refs 5th c.BC+]; κτήσεσθαι (-σασθαι codices) [Refs 5th c.BC+]; διαπράξεσθαι (-ξασθαι codices) [οἴομαι δεδειπνάναι 5th-6th c.BC: Aristophanes Comicus “Fragmenta” 464 ">Refs 5th c.BC+]; opposed to εἰδέναι, [Refs 5th c.BC+]:—passive, μάρτυρας δύο παρεχέτω ὀμνύντας οἰόμενον that he is the putative father, [Refs 4th c.BC+]
__IV parenthetically, mostly in first person, ἐν πρώτοισιν, ὀΐω, κείσεται among the first, I ween, will he be lying, [Refs 8th c.BC+]; in Attic dialect this parenthetic use is probably confined to the shorter form οἶμαι, imperfect ᾤμη; rarely in other persons than the first, as οὐκ οἴει ἀναγκασθήσετα; [Refs 5th c.BC+]; πόσης οἴεσθε γέμει σωφροσύνη; [Refs]
__IV.2 expressive of modesty or courtesy, to avoid over-great bluntness of assertion, [Refs 5th c.BC+]: even between a preposition and its case, ἐξ οἶμαι τῆς ἀκροτάτης ἐλευθερίας [Refs 5th c.BC+]; or between Article and substantive, οἱ γὰρ οἶμαι βέλτιστοι [Refs]
__V answering a question, I think so, I should think so, [Refs 5th c.BC+]; οἴεσθαί γε χρή one must think so, it would seem so, [Refs]
__VI Attic dialect phrases:
__VI.1 πῶς οἴε; you can't think how, to add force, like{πῶς δοκεῖς}; πόθος τὴν καρδίαν ἐπάταξε πῶς οἴει σφόδρα [Refs 5th c.BC+]
__VI.2 οἴομαι δεῖν I think it my duty, think fit, hence sometimes, intend, purpose, λέγειν οἴεται δεῖν ποιεῖν δεινούς his object is to train orators, [Refs 5th c.BC+]; [ὁ ἀκόλαστος] οἰόμενος δεῖν [διώκει τὰ ἡδέα] intentionally, [Refs 5th c.BC+]; but οἴομαι δὲ δεῖν οὐδέν methinks there is no need, [Refs 5th c.BC+]; must we not either think we know or really know? (δεῖν being superfluous).
__VI.3 οἴομαι without δεῖν I mean to, intend, οὐκ οἴει.. δοῦναι δίκη; [Refs 5th c.BC+]; οὐ βαλεῖν (variant{βάλλειν}).. ᾠήθη [Refs 4th c.BC+]