1) to come down
2) to come to, reach to
2a) it is becoming
2b) it is fit
Part of Speech: verb
Citing in TDNT: 3:437, 385
From G2596 and G2240; to reach to, that is, (neuter of present active participle, figuratively as adjective) becoming: - convenient, fit.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root καθήκω; click on the second column to search for that grammatical form of the root καθήκω; click on the third column to search for that word and grammatical form; click on the total to search for the root καθήκω.