Where does “tesi” come from?

tesi (Catalan) comes from Latin thēsis, from Ancient Greek θέσις, from Ancient Greek τίθημι, from Proto-Indo-European dʰeh₁- — to do, put, place.

tesi (Catalan): thesis

Definitions

Step	Language	Word	Meaning
1	Latin	thēsis	thesis
2	Ancient Greek	θέσις	a setting, placement, arrangement; deposit;...
3	Ancient Greek	τίθημι	I put, place, set; I make, cause to be; I make
4	Proto-Indo-European	dʰeh₁-	to do, put, place