revolutionary
     adj 1: markedly new or introducing radical change; "a revolutionary
            discovery"; "radical political views" [syn: {radical}]
     2: relating to or having the nature of a revolution;
        "revolutionary wars"; "the Revolutionary era"
     3: advocating or engaged in revolution; "revolutionary
        pamphlets"; "a revolutionary junta" [ant: {counterrevolutionary}]
     n : a radical supporter of political or social revolution [syn:
         {revolutionist}, {subversive}, {subverter}]
Source: WordNet® 2.0