Where does “centiesme” come from?

centiesme (Middle French) comes from Old French centesme, from Latin centēsimus, from Old Latin cesimus — hundredth.

Ancestry of “centiesme”, step by step

Step	Language	Word	Meaning
1	Old French	centesme	—
2	Latin	centēsimus	—
3	Old Latin	cesimus	hundredth

centiesme — Etymology, Origin & Word History | Etymology Explorer