The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Revolutionary \Rev`o*lu"tion*a*ry\, n.
   A revolutionist. [R.]
   [1913 Webster]

         Dumfries was a Tory town, and could not tolerate a
         revolutionary.                           --Prof.
                                                  Wilson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

revolutionary
    adj 1: markedly new or introducing radical change; "a
           revolutionary discovery"; "radical political views" [syn:
           revolutionary, radical]
    2: of or relating to or characteristic or causing an axial or
       orbital turn [syn: rotatory, revolutionary]
    3: relating to or having the nature of a revolution;
       "revolutionary wars"; "the Revolutionary era"
    4: advocating or engaged in revolution; "revolutionary
       pamphlets"; "a revolutionary junta" [ant:
       counterrevolutionary]
    n 1: a radical supporter of political or social revolution [syn:
         revolutionist, revolutionary, subversive,
         subverter]

Moby Thesaurus II by Grady Ward, 1.0:

240 Moby Thesaurus words for "revolutionary":
   Bolshevik, Bolshevist, Bolshie, Carbonarist, Carbonaro, Castroist,
   Castroite, Charley, Communist, Cong, Fabian, Fenian, Guevarist,
   Jacobin, Leninist, Mafioso, Maoist, Marxist, Mau-Mau, Puritan, Red,
   Red Republican, Roundhead, Sinn Feiner, Trotskyist, Trotskyite, VC,
   Vietcong, Wobbly, Yankee, Yankee Doodle, Young Turk, agitator,
   altered, anarch, anarchist, anarchistic, anarcho-syndicalist,
   antagonistic, antipathetic, authentic, avant-garde, beast, beldam,
   berserk, berserker, better, bomber, bonnet rouge, brawler,
   breakaway, brute, cataclysmic, catastrophic, changeable, changed,
   clashing, conflicting, contradicting, contradictory, converted,
   corrective, counteractant, counteracting, counteractive,
   countervailing, counterworking, cranky, creative,
   criminal syndicalist, crotchety, degenerate, demon, deviant, devil,
   different, disorderly, dissident, divergent, dragon, emendatory,
   extreme, extreme left-winger, extremist, extremistic, factious,
   fanatic, fiend, fire-eater, firebrand, firsthand, fresh, frondeur,
   fury, goon, gorilla, gradualistic, gunsel, hardnose, hell-raiser,
   hellcat, hellhound, hellion, holy terror, hood, hoodlum, hostile,
   hothead, hotspur, imaginative, improved, incendiary, inimical,
   innovative, insubordinate, insurgent, insurrectionary,
   insurrectionist, insurrecto, killer, left-wing extremist,
   lunatic fringe, mad dog, madcap, malcontent, maverick, meliorist,
   melioristic, metamorphosed, metastasized, mild radical,
   mildly radical, modified, monster, mugger, mutant, mutineer,
   mutineering, mutinous, new, nihilist, nihilistic, nonconformist,
   novel, obstreperous, opposing, oppositional, oppugnant, original,
   parlor Bolshevik, parlor pink, perverse, pink, pinko,
   progressionist, progressist, progressive, progressivist, qualified,
   rabid, radical, rampant, rapist, reactionary, rebel, rebellious,
   rebuilt, recalcitrant, red, reformational, reformative,
   reformatory, reformed, reformer, reformist, reformistic, renewed,
   renitent, repugnant, resistant, revisional, revisionist, revisory,
   revived, revolter, revolutional, revolutionary junta, revolutioner,
   revolutionist, revolutionizer, revulsionary, revulsive, rioter,
   riotous, sans-culotte, sans-culottist, savage, seditionary,
   seditious, she-wolf, spitfire, subversive, sweeping, syndicalist,
   termagant, terror, terrorist, tiger, tigress, tough, tough guy,
   traitor, traitorous, transformed, transilient, translated,
   transmuted, treasonable, turbulent, ugly customer, ultra,
   ultraconservative, ultraist, ultraistic, unbridled, underived,
   unique, unmitigated, unruly, utopian, utopist, violent, virago,
   vixen, wild, wild beast, witch, wolf, worse, yippie