Quick Definition
καθάπερ Adv even as
Strong's Definition
from 2505 and 4007; exactly as
KJV Usage: (even, as well) as
UBS Dictionary of the Greek New Testament
conj. | ἅ + -πέρ
1 It may be of interest to note that in Greek NT manuscripts καθάπερ and καθώσπερ are often alternative forms. As in the case of ὥσπερ and ὡσπερεί (64.13) in contrast with ὡς[a] and ὡσεί[a] (64.12), so καθάπερ and καθώσπερ appear to be somewhat more emphatic than καθά and καθώς[c] (64.14).
conj. | ὡς + -πέρ
64.15 · Comparison
just as, precisely as an emphatic marker of comparison between events and states
1 It may be of interest to note that in Greek NT manuscripts καθάπερ and καθώσπερ are often alternative forms. As in the case of ὥσπερ and ὡσπερεί (64.13) in contrast with ὡς[a] and ὡσεί[a] (64.12), so καθάπερ and καθώσπερ appear to be somewhat more emphatic than καθά and καθώς[c] (64.14).
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
καθάπερ, (καθ᾽ ἅπερ), according as, just as, even as, [ (“kaθά marking the comparison, πέρ (akin to the prep. περί) the latitude of the application”): Ro. ix.13 WHtxt.; x. 15 WII txt.; also] xi. 8 and 1 Co. x. 10in T Tr WH; 2 Co. iii. 13,18 [here WH mrg. καθώσπερ] : 1 ΤῊ. 11. 11: καθάπερ καί, Ro. iv. 6; 2 Οο.1. 14; 1 Th. iii. 6, 125 iv. 5; Heb. iv. 2, and RG in Heb. v.43; καθάπερ foll. by οὕτω (or οὕτως), Ro. xii.4; 1 Co. xii. 12; 2 Co. viii. 11. ({[From Arstph. down]; Sept. for Ww, Ex. vii. 6, 10.)
Mounce Concise Greek Dictionary
καθάπερ kathaper 13x
can function as an adverb, even as, just as, Rom. 3:4; 4:6; 9:13; 10:15; 11:8; 12:4; 1 Cor. 10:10; 12:12; 2 Cor. 1:14; 3:13, 18; 8:11; 1 Thess. 2:11; 3:6, 12; 4:5; Heb. 4:2*
Abbott-Smith Greek Lexicon
καθάπερ (for καθ’ ἅπερ = καθά) adv.,
[in LXX for כַּאֲשֶׁר, Ge 12:4, Ex 7:6, al.;]
just as, even as: Ro 3:4 4:6 9:13 10:15 11:8 12:4, I Co 10:10 12:12, II Co 1:14 3:13, 18 8:11, I Th 2:11 3:6, 12 4:6, He 4:2.†
Moulton & Milligan — Vocabulary of the Greek NT
καθάπερ is very common in the legal phrase καθάπερ ἐκ δίκης. Thus our earliest Greek marriage contract, P Eleph 113 (B.c. 311-0) (= Sélections, p. 3), concludes—m δὲ πρᾶξις ἔστω καθάπερ ἐγ δίκης, “and let the right of execution be as if a formal decree of the Court had been obtained”: cf. P Amh II. 4613 (ii/B.c.), P Fay 2214 (i/a.p.), 2. 9193 (A.D. 99), etc. Other exx. of the word are P Hib I. 498 (c. B.c. 257) e[trJov δὲ αὐτῶι καθάπερ ἔγραψα [αἸὐτῶι ὅπως ἂν ἐμβάληται τὰς ἐλαίας εἰς βίκους, ‘‘tell him that, as I wrote to him, he is to put the olives into jars’’ (Edd.), P Eleph 121 (B.c, 223-2) καθάπερ ὥιου δεῖν, ‘nach deinem Antrag,’”” P Vat Α1Ὁ (B.c. 168) (= Witkowski 2//.2, p. 65) ἠβουλόμην δὲ Kal σὲ παραγεγονέναι εἰς τὴν πόλ[ι]ν, καθάπερ Kal Κόνων καὶ οἱ ἄλλοι οἱ ἀπειλη[μμένοι] πάντες, ὅπως] καὶ κτλ. In the decrees τὰ μὲν ἄλλα καθάπερ ὁ δεῖνα ‘‘ was the usual introduction to an amendment proposed in the Ecclesia to a probouleuma,” e.g. C/G 848! Κέφαλος εἶπε: τὰ μὲν ἄλλα καθάπερ τῇ βουλεῖ: ἀναγράψαι δὲ. .. : see RobertsGardner, p. 18, and cf. Milligan Zhess. p. 25. ’ καθάαπτω
Liddell-Scott-Jones — Greek-English Lexicon
καθάπερ (kathaper) — just as. Included with: κᾰθά [θᾰ], adverb for καθ᾽ ἅ, according as, just as, [LXX+4th c.BC+]; ὁ κ. παρατεταγμένος σφυγμός the (so to speak) 'regular' pulse (a military metaphor), [Refs 2nd c.AD+]
II. also καθάπερ, Ionic dialect κατάπερ, [Refs 5th c.BC+]: frequently in legal instruments, ἡ πρᾶξις ἔστω κ. ἐκ δίκης [Refs 4th c.BC+], etc.: with a participle, like{ὡς},{ἅτε}, [Refs 2nd c.AD+]:—strengthened, καθάπερ εἰ (Ionic dialect κατάπερ εἰ, [Refs 5th c.BC+], like as if, exactly as, [Refs 5th c.BC+]; καθάπερ ἄν (for ἐάν) [Refs 4th c.BC+]; καθάπερ ἂν εἰ [Refs 5th c.BC+] —μάχαιραν κ. like a knife, [Refs 3rd c.AD+]