Lexical Definition

‎θεωρέω‎ theōréō (theh-o-reh'-o) to see/experience ^G:V
from a derivative of ‎θεάομαι‎ (perhaps by addition of ‎ὁράω‎)

behold, consider, look on, perceive, see.

• to be a spectator of, i.e. discern, (literally, figuratively (experience) or intensively (acknowledge))

Abbott-Smith

θεωρέω, -ῶ (< θεωρός, a spectator, < θεάομαι), [in LXX chiefly for ראה, חזה;] (pres. and impf. only, exc. Jo 7:3 (fut.), Mt 28:1, Lk 23:48, Jo 8:51, Re 11:12 (aor.); Bl., §24);
1. (cl.), to look at, gaze, behold: absol., Mt 27:55, Mk 15:40, Lk 23:35; seq. πῶς, Mk 12:41; ποῦ, Mk 15:47; c. acc. pers., Jo 6:40, 62 12:45 16:10-19, Ac 3:16 20:38 25:24, Re 11:11, 12; id. c. ptcp., Mk 5:15, Lk 10:18, Jo 6:19 10:12 20:12, 14, I Jo 3:17; c. acc. rei, Mt 28:1, Lk 14:29 21:6 23:48, Jo 2:23 6:2 7:3, Ac 4:13 8:13; id. c. ptcp., Jo 20:6, Ac 7:56 10:11; seq. ὅτι, Ac 19:26.
2. In popular lang. (Kennedy, Sources, 155; Bl., §24, s.v. ὁρᾶν), in pres. and impf. = ὁράω, to see, perceive, discern: seq. ὅτι, Mk 16:4, Jo 4:19 12:19, Ac 19:26 27:10; πόσαι, Ac 21:20; πηλίκος, He 7:4; c. acc. rei, Mk 5:38; id. c. ptcp., Ac 17:16 28:6; c. acc. pers., Mk 3:11, Jo 14:19, Ac 9:7 17:22; πνεῦμα, Lk 24:37; τὸ π., Jo 14:17; seq. ὅτι, Jo 9:8; c. ptcp., Lk 24:39.
3. Hebraistically, to experience, partake of: τ. θάνατον, Jo 8:51 (cf. Ps 88(89):49); τ. δόξαν, Jo 17:24 (cf. ἀνα-, παρα-θερρέω).†

Abbott-Smith References

Liddell-Scott-Jones

θεωρέω-έω:—

passive, future -ηθήσομαι[Refs 2nd c.AD+]: future middle in passivesense,[Refs 2nd c.AD+]: (θεωρέωός):—to be a θεωρέωός [Refs 5th c.BC+]; of the states which sent θεωρέωοί, οἱ Ἀθηναῖοι ἐθεώρουν ἐς τὰ Ἴσθμια [Refs 5th c.BC+]

__2 to be sent to consult an oracle, [Refs 5th c.BC+]
__II of spectators at games, τὰ Ὀλύμπια [Refs 5th c.BC+]; θ. τινά to see him act, [Refs 5th c.BC+]; to go as a spectator, ἐς τὰ Ἐφέσια [Refs 5th c.BC+]; see entry ὀβολός [Refs]
__III look at, behold, γῆν πολλήν [Refs 5th c.BC+]; inspect, review soldiers, [Refs 5th c.BC+]: absolutely, gaze, gape, ἑστηκὼς θ. [θεωρέωέω} 5, τὴν σελήνην 2nd c.AD: Galenus Medicus 19.542. ">Refs 4th c.BC+]
__III.2 of the mind, contemplate, consider, αὐτῇ τῇ ψυχῇ αὐτὴν τὴν ψυχὴν θ. [Refs 5th c.BC+]: followed by an interrogative, τοῦτο θ., εἰ τἀληθῆ λέγω [Refs 4th c.BC+]; θ. τι ἔκ τινος to judge of one thing by another, τὴν ἔννοιαν ἐκ τῶν ἔργων [Refs 4th c.BC+]; θ. τι πρός τι compare one thing with another, [θεωρέωῶμα; [prev. work]315; τοὺς πρέσβεις θ. πρὸς τὸν καιρὸν καθ᾽ ὃν ἐπρές βευον 4th c.BC: Aeschines Orator 2.80 ">Refs 4th c.BC+]; θ. [τι τεκμηρίοις] [Refs 4th c.BC+]
__III.2.b observe, θ. μᾶλλον τοὺς πέλας δυνάμεθα ἢ ἑαυτούς [θεωρέωήσατε, ὡς.. ποιουμένου 4th c.BC: Lycurgus Orator 28 ">Refs 4th c.BC+]:—passive, τεθεώρηται τοῦτο μάλιστα ἐπὶ τῶν περιστερῶν [Refs 4th c.BC+]; λόγῳ θεωρέωεῖσθαι, of objects not accessible to sense, [θεωρέωεῖται [prev. work]1.13. ">Refs 1st c.BC+]
__III.2.c perceive, with infinitive, ἀναγκαῖον ὑπάρχειν [Refs 1st c.BC+]
__III.2.d absolutely, speculate, theorize, ἀκριβῶς, φορτικῶς, [Refs 4th c.BC+]; λογικῶς, φυσικῶς, [Refs]; θ. ἔκ τινος to conclude by observation from..,[Refs] —passive, ἡ παρὰ τοῖς Ἕλλησι τεθεωρέωημένη μάθησις Ael.Tact.[θεωρέωήσασα is probably corrupt for ἐωρ- in 5th c.BC: Sophocles Tragicus “Oedipus Coloneus” 1084 (Lyric poetry).) ">Refs 5th c.BC+]