The Collaborative International Dictionary
avant-guard
avant-guard \a*vant"-guard`\ ([.a]*v[aum]nt"-g[aum]rd`; 277), n.
The van or advanced body of an army. See Vanguard.
Same as avant-garde, n..
Wiktionary
avant-guard
n. 1 (context archaic English) The vanguard or advanced body of an army. 2 New and (usually) experimental; as, ''avant-guard music or film''.