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The Collaborative International Dictionary
avant-guard

avant-guard \a*vant"-guard`\ ([.a]*v[aum]nt"-g[aum]rd`; 277), n.

  1. The van or advanced body of an army. See Vanguard.

  2. 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''.