Source : Webster's Revised Unabridged Dictionary (1913)

Jacobinism \Jac"o*bin*ism\, n. [Cf. F. Jacobinisme.]
   The principles of the Jacobins; violent and factious
   opposition to legitimate government.

         Under this new stimulus, Burn's previous Jacobitism
         passed towards the opposite, but not very distant,
         extreme of Jacobinism.                   --J. C.
                                                  Shairp.

Source : WordNet®

Jacobinism
     n : the ideology of the most radical element of the French
         Revolution that instituted the Reign of Terror