From The Collaborative International Dictionary of English v.0.48 [gcide]:
avant-garde \a*vant`-garde"\ ([.a]*v[aum]nt"-g[aum]rd`), a.
1. Of, pertaining to, or belonging to the avant-garde.
[PJC]
2. Characterized by the use of experimental techniques;
modern; daring; radical.
[PJC]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
avant-garde \a*vant`-garde"\ ([.a]*v[aum]nt"-g[aum]rd`), n. [F.
avant before + E. guard, F. avant-garde. See Avaunt.]
The most advanced group of people in any field of endeavor,
especially in literary and artistic work, usually
characterized by new ideas and experimental techniques.
[PJC]
From WordNet (r) 3.0 (2006) [wn]:
avant-garde
adj 1: radically new or original; "an avant-garde theater piece"
[syn: avant-garde, daring]
n 1: any creative group active in the innovation and application
of new concepts and techniques in a given field (especially
in the arts) [syn: avant-garde, vanguard, van, {new
wave}]