Source : Webster's Revised Unabridged Dictionary (1913)

Revolutionary \Rev`o*lu"tion*a*ry\, a. [Cf. F.
   r['e]volutionnaire.]
   Of or pertaining to a revolution in government; tending to,
   or promoting, revolution; as, revolutionary war;
   revolutionary measures; revolutionary agitators.

Revolutionary \Rev`o*lu"tion*a*ry\, n.
   A revolutionist. [R.]

         Dumfries was a Tory town, and could not tolerate a
         revolutionary.                           --Prof.
                                                  Wilson.

Source : WordNet®

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}]

revolutionary
     n : a radical supporter of political or social revolution [syn:
         {revolutionist}, {subversive}, {subverter}]