Where does “mesurer” come from?

mesurer (Old French) comes from Latin mēnsūrō, from Latin mēnsūra, from Latin mētior, from Proto-Indo-European meh₁- — to measure.

Ancestry of “mesurer”, step by step

Step	Language	Word	Meaning
1	Latin	mēnsūrō	—
2	Latin	mēnsūra	—
3	Latin	mētior	—
4	Proto-Indo-European	meh₁-	to measure

mesurer — Etymology, Origin & Word History | Etymology Explorer