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Definition of revolutionary : 1. A revolutionist.
2. Of or pertaining to a revolution in government; tending to, or promoting, revolution; as, revolutionary war; revolutionary measures; revolutionary agitators.

Synonyms:

disturbing, novel, subverter, subversive, advanced, extremist, patriotic, cataclysmic, loyal, seditious, fanatical, unprecedented, edge, destructive, insurrectionary, factious, extreme, destroying, far-out, concern, innovative, rabid, revolutionist, radical, new, unusual, treasonable, ultra, politics, insurgent, basal, resist, revolting, sweeping, riotous, fanatic, rotatory

rebellious, upheaving, upsetting, restructuring, mutinous

Usage examples:

• It seems probable that 25, 000 Negroes a year arrived in America between 1698 and 1707. After the Asiento of 1713 this number rose to 30, 000 annually, and before the Revolutionary War it had reached at least 40, 000 and perhaps 100, 000 slaves a year. - "The Negro", W.E.B. Du Bois.
• Should the king thus prove victorious, the leaders in the revolutionary movement had sinned too deeply to hope for pardon. - "Madame Roland, Makers of History", John S. C. Abbott.
• He did his best to prevent the Revolutionary War, but he couldn't do it. - "Comic History of the United States", Bill Nye.