Where does “dessein” come from?

dessein (French) comes from Middle French desseigner, from Italian disegnare, from Latin designāre.

dessein (French): intention; plan; design

Definitions

Step	Language	Word	Meaning
1	Middle French	desseigner	—
2	Italian	disegnare	to draw, outline, trace; to design, style
3	Latin	designāre	—

dessein — Etymology, Origin & Word History | Etymology Explorer