Where does “plēnārius” come from?

plēnārius (Latin) comes from Latin plēnus, from Proto-Italic plēnos, from Proto-Indo-European pl̥h₁nós, from Proto-Indo-European pleh₁- — to fill.

Ancestry of “plēnārius”, step by step

Step	Language	Word	Meaning
1	Latin	plēnus	—
2	Proto-Italic	plēnos	full
3	Proto-Indo-European	pl̥h₁nós	full
4	Proto-Indo-European	pleh₁-	to fill

plēnārius — Etymology, Origin & Word History | Etymology Explorer