Lexical Definition

‎καθήκω‎ kathḗkō (kath-ay'-ko) be fit G:V
from ‎κατά‎ and ‎ἥκω‎

convenient, fit.

Usage: 5 forms in 15 verses
Form Translated As     In Verse(s)
καθῆκεν it was proper Acts.22.22
καθήκοντασ fitting LXX.Exod.16.18
is fitting LXX.Exod.16.16
καθήκοντα being fit LXX.Exod.36.1
being proper Rom.1.28
fit LXX.Exod.5.13
καθήκον fit LXX.Exod.5.19
fitting LXX.Exod.16.21
καθήκει fitting LXX.Lev.9.16
is fit LXX.Lev.5.10LXX.1Sam.2.16LXX.Ezek.21.27
is fit for me LXX.Hos.2.5
is fitting LXX.Deut.21.17
it is fit LXX.Gen.19.31

Abbott-Smith

καθ-ήκω, [in LXX: impers., Le 5:10, Ez 21:27* (32*), al. (מִשְׁפָּט); τὰ κ., Ex 5:13, al. (דָּבָר), etc.;]
1. to come down, come to.
2. to be fit, proper: impers., c. acc. et inf., Ac 22:22 (on the tense, v. Bl., § 63, 4); τὰ μὴ καθήκοντα, Ro 1:28.†

Abbott-Smith References

Book Refs
Exodus 5:13
Leviticus 5:10
Ezekiel 21:27* · 21:32*
Acts 22:22
Romans 1:28

Liddell-Scott-Jones

καθήκω,

Ionic dialect κατήκω, (see. ἥκω) come or go down, especially to fight, [Refs 4th c.BC+]

__2 come down to, reach to, ἐς θάλασσαν [Refs 5th c.BC+]; ἐπὶ θάλ. [Refs 5th c.BC+]; κέρκος.. εἰς λεπτὸν καθήκουσα tapering away, [Refs 4th c.BC+]
__3 come in due course to any one, καθῆκεν ἐς ἡμᾶς λόγος the turn of speaking came to us, [Refs 4th c.BC+]; τῆς βολῆς καθηκούσης ἐς αὐτόν [Refs 1st c.AD+]
__4 of Time, ὁπότε καθήκοι Χρόνος [καθήκωσι 4th c.BC: Aristoteles Philosophus “Historia Animalium” 591a8; πρότερον ἢ τὴν ὥραν καθήκειν “PRev.Laws” 41.14 (3rd c.BC)">Refs 5th c.BC+]; in participle, τοῦ καθήκοντος Χρόνου the normal time, [Refs 5th c.BC+]; αἱ κ. ἡμέραι the regular, proper days, [Refs 4th c.BC+]; of events, ἑορτῆς εἰς τὰς ἡμέρας ἐκείνας καθηκούσης as the festival fell on those days, [Refs 2nd c.BC+]; ἐκκλησίαν ποιῆσαι, ὅταν ἐκ τῶν νόμων καθήκῃ when it is legally due, [Refs 4th c.BC+]; κ. σύνοδος or ἐκκλησία, [Refs 2nd c.BC+]
__II to be meet, fit, proper, τοῖς κ. [νομίμοις] [Refs 4th c.BC+]; τὰς ἐσθῆτας τὰς κ. ἀεὶ ταῖς περιθεταῖς suiting them, [Refs 2nd c.BC+]; καθήκων ἐκ τῶν νομίμων ἀριθμός a quorum, [Refs 1st c.BC+]
__II.2 impersonal, καθήκει μοι it belongs to me, is my duty, with infinitive, οἷς καθήκει ἁθροίζεσθαι [Refs 5th c.BC+]imperfect καθῆκε in present sense, it is meet, proper, οὐδ᾽ ἅψασθαι καθῆκέ τινων[NT]participle, τὰ καθήκοντα one's due or duty, [Refs 5th c.BC+]; ποιεῖν τὸ κ. [Refs 5th c.BC+], title of work by Zeno,[Refs]; μὴ κ. unbecoming, [NT]
__II.3 τὰ κατήκοντα the present crisis, [Refs 5th c.BC+]
__II.3.b τὰ καθήκοντα the payments due, [Refs 2nd c.BC+]
__II.4 adverb present participle καθηκόντως fittingly, properly, [Refs 4th c.BC+]; consistently with duty, [Refs 1st c.AD+]; appropriately, with dative, τῷ τόπῳ Aristeas 81; κ. ἔχειν πρός τι [Refs]
__III τὸ καθῆκον the precise proportion, [Refs 4th c.BC+]

LSJ Scripture Refs: Acts.22.22Rom.1.28