Quick Definition
κραταιόω v. I strengthen, confirm, grow strong
Strong's Definition
from 2900; to empower, i.e. (passively) increase in vigor
KJV Usage: be strengthened, be (wax) strong
UBS Dictionary of the Greek New Testament
verb | κρατέω
23.134 · (κραταιόομαι[a]) · Physiological Processes and States · Health, Vigor, Strength
to become strong to become strong and healthy, with the implication of physical vigor In employing an expression to translate ‘to become strong,’ it is important to avoid the impression of ‘to become muscular.’ The emphasis is upon total physical vigor, not mere muscular strength.
76.10 · (κραταιόομαι[b]) · Power, Force
to become strong, to become powerful (derivative of κραταιός ‘powerful,’ 76.9) to become strong psychologically In 1CO 16:13 κραταιόομαι must be understood in a non-physical sense. The implication is that the believer is to be sufficiently strong as to be able to dominate any evil influence.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
κραταιόω, -@: Pass., pres. impv. 2 pers. plur. κραταιοῦσθε impf. 3 pers. sing. ἐκραταιοῦτο; 1 aor. inf. κραταιωθῆναι ; (κράτος) ; only bibl. and eccles., for the classic κρατύνω ; Sept. mostly for pin; in pass. several times for yD8; to strengthen, make strong, (Vulg. conforto [and in Eph. iii. 16 conroboro]); Pass. to be made strong, to increase in strength, to grow strong: pass. with dat. of respect, πνεύματι, Lk. i. 80; ii. 40 [here GLT Tr WH om. mre part]; δυνάμει, Eph. iii. 16, (cf. ἰσχύειν τοῖς σώμασι, Xen. mem. 2, 7, 7); ἀνδρίζεσθε, κραταιοῦσθε, i. 6. show yourselves brave [A. V. be strong], 1 Co. xvi. 13 (ἀνδρίζεσθε «. κραταιούσθω ἡ καρδία ὑμῶν, Ps. xxx. (xxxi.) 25; κραταιοῦσθε κ. γίνεσθε εἰς ἄνδρας, 1 S. iv. 9; ἀνδρίζου k. κραταιωθῶμεν, 2 S. x. 12).
Mounce Concise Greek Dictionary
κραταιόω krataioō 4x
to strengthen, render strong, corroborate, confirm; pass. to grow strong, acquire strength, Lk. 1:80; 2:40; Eph. 3:16; to be firm, resolute, 1 Cor. 16:13*
Abbott-Smith Greek Lexicon
† κραταιόω, -ῶ
(late form of κρατύνω; < κράτος), [in LXX chiefly for חזק;]
to strengthen; pass., to wax strong: Lk 2:40, I Co 16:13; πνεύματι, Lk 1:80; δυνάμει κ. διὰ τ. πνεύματος, Eph 3:16.†
Liddell-Scott-Jones — Greek-English Lexicon
κραταιόω (krataioō) — to strengthen. κρᾰταιό-ω, strengthen, τὰς χεῖράς τινος Vetus Testamentum Graece redditum LXX.1Ki.23.16, +others:—passive, [NT], etc.; κ. ὑπέρ τινα to be too strong for him, prevail against him, [LXX]
2. passive, to be determined, κ. τοῦ πορεύεσθαι [LXX]
II. intransitive in active, prevail, ἐπί τινας [LXX]; ὑπέρ τινας [LXX]
III. middle, control, [Refs 1st c.AD+].