Source : Webster's Revised Unabridged Dictionary (1913)

Insurrectionist \In`sur*rec"tion*ist\, n.
   One who favors, or takes part in, insurrection; an insurgent.

Source : WordNet®

insurrectionist
     n : a person who takes part in an armed rebellion against the
         constituted authority (especially in the hope of
         improving conditions) [syn: {insurgent}, {freedom fighter},
          {rebel}]