The Collaborative International Dictionary of English v.0.48:

Uprising \Up*ris"ing\, n.
   1. Act of rising; also, a steep place; an ascent. "The steep
      uprising of the hill." --Shak.
      [1913 Webster]

   2. An insurrection; a popular revolt. --J. P. Peters.
      [1913 Webster]

WordNet (r) 3.0 (2006):

uprising
    n 1: organized opposition to authority; a conflict in which one
         faction tries to wrest control from another [syn:
         rebellion, insurrection, revolt, rising,
         uprising]

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "uprising":
   abruptness, acclinate, acclivitous, acclivity, anabasis, anabatic,
   ascendant, ascending, ascension, ascensional, ascensive, ascent,
   civil disorder, clamber, climb, climbing, coup d'etat, elevation,
   emeute, escalade, fountain, general uprising, gradient, gush,
   gyring up, in the ascendant, increase, insurgence, insurgency,
   insurrection, jacquerie, jet, jump, leap, leaping, levee en masse,
   levitation, mount, mounting, mutiny, outbreak, peasant revolt,
   precipitousness, putsch, rampant, rearing, rebellion, revolt,
   revolution, riot, rise, rising, rising ground, rocketing up,
   saltation, saltatory, scandent, scansorial, shooting up,
   skyrocketing, soaring, spiraling, spout, spring, springing, spurt,
   steepness, surge, takeoff, taking off, uparching, upclimb,
   upcoming, updraft, upgang, upgo, upgoing, upgrade, upgrowth,
   uphill, uphillward, upleap, uplift, upping, uprisal, uprise,
   uprush, upshoot, upslope, upsloping, upsurge, upsurgence, upsweep,
   upswing, upward, upwith, vault, vertical height, verticalness,
   zooming