Where does “avantgardgiste” come from?

avantgardgiste (Norman) comes from French avant-garde, from Old French avantgarde.

avantgardgiste (Norman): avantgardist

Definitions

Step	Language	Word	Meaning
1	French	avant-garde	vanguard; avant-garde, firing line
2	Old French	avantgarde	—

avantgardgiste — Etymology, Origin & Word History | Etymology Explorer