Lexical Definition

‎καθάπερ‎ katháper (kath-ap'-er) just as ^G:CONJ
from ‎καθά‎ and ‎περ‎

(even, as well) as.

• exactly as

Abbott-Smith

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.†

Abbott-Smith References

Liddell-Scott-Jones

Included with: καθάπερ [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+]

_{LSJ Scripture Refs: LXX.Gen.7.9}