Where does “decēns” come from?

decēns (Latin) comes from Latin decet, from Proto-Italic dekēō, from Proto-Indo-European deḱ- — take; perceive.

Ancestry of “decēns”, step by step

Step	Language	Word	Meaning
1	Latin	decet	it adorns; it is decent, suitable, seemly, or...
2	Proto-Italic	dekēō	fit, be right
3	Proto-Indo-European	deḱ-	take; perceive

decēns — Etymology, Origin & Word History | Etymology Explorer