Where does “similitude” come from?

similitude (French) comes from Latin similitūdō, from Latin similis, from Proto-Italic semalis, from Proto-Indo-European sem- — together, one.

similitude (French): similitude

Definitions

Step	Language	Word	Meaning
1	Latin	similitūdō	—
2	Latin	similis	similar
3	Proto-Italic	semalis	—
4	Proto-Indo-European	sem-	together, one

similitude — Etymology, Origin & Word History | Etymology Explorer