Lexical Definition

‎ἰσχύω‎ ischýō (is-khoo'-o) be strong ^G:V
from ‎ἰσχύς‎

be able, avail, can do(-not), could, be good, might, prevail, be of strength, be whole, + much work.

• to have (or exercise) force (literally or figuratively)

Abbott-Smith

ἰσχύω (< ἰσχύς), [in LXX for חזק, גִּבּוֹר, עצם, etc.;]
1. to be strong in body: Mt 9:12, Mk 2:17.
2. to be powerful, have power, prevail: Ac 19:20, Re 12:8; seq. κατά, c. gen. pers., Ac 19:16; c. inf., to be able (MM, Exp., xv): Mt 8:28 26:40, Mk 5:4 9:18 (inf. understood) 14:37, Lk 6:48 8:43 13:24 14:6, 29, 30 16:3 20:26, Jo 21:6, Ac 6:10 15:10 25:7 27:16; c. acc., Phl 4:13, Ja 5:16; of things, to avail, be serviceable (MM, Exp., xv): Mt 5:13, Ga 5:6, He 9:17 (cf. ἐν-, ἐξ-, ἐπ-, κατ-ισχύω).†

Abbott-Smith References

Liddell-Scott-Jones

ἰσχύω-ύω

(ἰσχύωύς), [Refs]: imperfect ἴσχυον [Refs 5th c.BC+]: future ἰσχύωύσω [Refs 5th c.BC+]: aorist ἴσχῡσα [Refs 5th c.BC+]: perfect ἴσχῡκα [Refs 4th c.BC+]:—passive, aorist κατ-ισχύθην [Refs 1st c.BC+]: (ἰσχύωύς):—to be strong in body, [ἰσχύωύοιεν 5th-6th c.BC: Xenophon Historicus “Institutio Cyri (Cyropaedia)” 6.1.24; ὃς μέγιστον ἴσχυσε στρατοῦ 5th c.BC: Sophocles Tragicus “Ajax” 502; ἰ. τοῖς σώμασιν 5th-6th c.BC: Xenophon Historicus “Memorabilia” 2.7.7; τοῦ σώματος ἰσχύωύοντος 5th c.BC: Antipho Orator 5.93 ">Refs 5th c.BC+]; ἴσχυόν τ᾽ αὐτὸς ἐμαυτοῦ, i.e. I had all my strength, [Refs 5th c.BC+]; ἰ. ἐκ νόσου to be recovering, [Refs 5th c.BC+]

__2 to be powerful, prevail, μηδὲν μεῖον ἰ. Διός [Refs 4th c.BC+]; πλέον, μεῖζον ἰ., [Refs 5th c.BC+]; later ἰ. πρός τινα prevail against, [LXX]; ἐπί τινας[LXX]; ἰ. τινί to be strong in a thing, σοφία ἀνὴρ ὑπὲρ ἀνδρὸς ἰσχύωύει [Refs 5th c.BC+]; ὅθεν ἰσχύωύομεν, ᾗπερ ἰσχύωύουσι, [Refs 5th c.BC+]; ἰ. παρά τινι have power or influence with one, [Refs 4th c.BC+]
__2.b of things, prevail, ὅρκος οὔτι Ζηνὸς ἰ. πλέον [ἰσχύωῦον τρέφω 5th c.BC: Sophocles Tragicus “Oedipus Tyrannus” 356 ">Refs 5th c.BC+]; τὸ δίκαιον ἐν πᾶσιν ἰ. [Refs 4th c.BC+]; have force, ἃ ὡρίσω σὺ δίκαια, ταὐτὰ.. καὶ κατὰ σοῦ προσήκει τοῖς ἄλλοις ἰσχύωύειν [ἰσχύωύειν 4th c.BC: Aristoteles Philosophus “Politica” 1280a28 ">Refs 4th c.BC+]; νομὴ ἄδικος οὐδὲν ἰ. is of no force, [Refs 2nd c.AD+]; ἰσχύωῦόν τι something permanent, probably in [Refs 4th c.BC+]: c.infinitive, ὁ καιρὸς ἰσχύωύει.. πράττειν [NT+4th c.BC+]
__3 to be worth or equivalent to, ἡ μνᾶ ἰσχύωύει λίτρας δύο καὶ ἥμισυ [Refs 1st c.AD+]; αἱ ψῆφοι τάλαντον ἰσχύωύουσιν (probably to be read instead of ἴσχουσιν) [Refs 2nd c.BC+]
__4 active, condense, νεφέλας [LXX]
__4.b ἄρτον πᾶσαν ἡδονὴν ἰσχύωύοντα making strong.. ,[LXX] (in se habentem, Vulg.).
__5 -ύοντες ἀστέρες those in dominating positions, Serapion in [Refs 5th c.BC+]; later, ῠ sometimes in present and imperfect, [Refs 3rd c.BC+]

_{LSJ Scripture Refs: LXX.Ps.12.4* ☩ LXX.2Chr.2.6* ☩ Mark.5.4}