Where does “percensendus” come from?

percensendus (Latin) comes from Latin percenseo, from Latin per-, from Proto-Italic peri-.

Definitions

Step	Language	Word	Meaning
1	Latin	percenseo	I count over, reckon up, enumerate, go through,...
2	Latin	per-	Used to make adjectives or verbs that are "very"...
3	Proto-Italic	peri-	—

percensendus — Etymology, Origin & Word History | Etymology Explorer