avant-garde UK /æˈvɑ̃t.ɡɑːd/US /ˌɑˌvɑntˈɡɑɹd/noun 2adjective 1forms 3 noun2 •Any group of people who invent or promote new techniques or concepts, especially in the arts. •(no longer used) The vanguard of an army or other force. adjective1 •Innovative and pioneering, especially when extremely or obviously so.It was a very avant-garde production. formsavant-gardes · more avant-garde · most avant-garde