Word Origin
from kata and hékó
Definition
to be proper or fitting
NASB Translation
proper (1), should...be allowed (1).

STRONGS NT 2520: καθήκω

καθήκω; (from Aeschylus, Sophocles down);

1. to come down.

2. to come to, reach to; impersonally, καθήκει, it is becoming, it is fit (cf. German zukommen), Ezekiel 21:27; οὐ καθῆκεν (Rev. καθῆκον), followed by the accusative with an infinitive, Acts 22:22 (Winers Grammar, 282 (265); Buttmann, 217 (187)); τά μή καθήκοντα, things not fitting, i. e. forbidden, shameful, Romans 1:28; 2 Macc. 6:4. Cf. ἀνήκω.

καθήκει καθηκεν καθήκεν καθῆκεν καθήκον καθηκοντα καθήκοντα καθήκοντας καθήλωσον katheken kathêken kathēken kathē̂ken kathekonta kathēkonta kathḗkontaInterlinear Greek • Interlinear Hebrew • Strong's Numbers • Englishman's Greek Concordance • Englishman's Hebrew Concordance • Parallel Texts