Where does “avantgardgisme” come from?

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

avantgardgisme (Norman): avant-gardism

Definitions

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

avantgardgisme — Etymology, Origin & Word History | Etymology Explorer