The Collaborative International Dictionary of English v.0.48:

Tumult \Tu"mult\, n. [L. tumultus; probably akin to Skr. tumula
   noise, noisy, and perhaps to L. tumere to swell, E. tumid:
   cf. F. tumulte.]
   1. The commotion or agitation of a multitude, usually
      accompanied with great noise, uproar, and confusion of
      voices; hurly-burly; noisy confusion.
      [1913 Webster]

            What meaneth the noise of this tumult ? --1 Sam. iv.
                                                  14.
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            Till in loud tumult all the Greeks arose. --Pope.
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   2. Violent commotion or agitation, with confusion of sounds;
      as, the tumult of the elements. --Addison.
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   3. Irregular or confused motion; agitation; high excitement;
      as, the tumult of the spirits or passions.
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   Syn: Uproar; ferment; disturbance; turbulence; disorder;
        confusion; noise; bluster; hubbub; bustle; stir; brawl;
        riot.
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The Collaborative International Dictionary of English v.0.48:

Tumult \Tu"mult\, v. i.
   To make a tumult; to be in great commotion. [Obs.]
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         Importuning and tumulting even to the fear of a revolt.
                                                  --Milton.
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WordNet (r) 3.0 (2006):

tumult
    n 1: a state of commotion and noise and confusion [syn:
         tumult, tumultuousness, uproar, garboil]
    2: violent agitation [syn: tumult, turmoil]
    3: the act of making a noisy disturbance [syn: commotion,
       din, ruction, ruckus, rumpus, tumult]

Moby Thesaurus II by Grady Ward, 1.0:

163 Moby Thesaurus words for "tumult":
   Bedlam let loose, ado, affray, agitation, bedlam, blast, bluster,
   bobbery, boil, boiling, bother, botheration, brawl, broil,
   brouhaha, burst, bustle, cacophony, chaos, charivari, chirm, churn,
   clamor, clangor, clap, clatter, commotion, confusion, conturbation,
   convulsion, din, discomposure, discord, disorder, disquiet,
   disquietude, disturbance, donnybrook, donnybrook fair,
   drunken brawl, dustup, ebullience, ebullition, eddy, effervescence,
   embroilment, excitement, fanaticism, feery-fary, ferment,
   fermentation, fever, feverishness, fidgetiness, fidgets, fit, flap,
   flurry, fluster, flutter, flutteration, flutteriness, foment,
   fomentation, foofaraw, fracas, free-for-all, frenzy, fume, furor,
   furore, fury, fuss, fussiness, hassle, hell broke loose,
   helter-skelter, howl, hubbub, hue and cry, hullabaloo, hurly-burly,
   hurry, hurry-scurry, inquietude, insurrection, jangle, jitters,
   jumpiness, loud noise, maelstrom, malaise, melee, moil, nerviness,
   nervosity, nervousness, noise, noise and shouting, outcry,
   pandemonium, passion, pell-mell, perturbation, pother, racket,
   rage, rampage, rattle, restlessness, rhubarb, riot, roar, roil,
   rough-and-tumble, roughhouse, rout, row, ruckus, ruction, ruffle,
   rumble, rumpus, scramble, seethe, seething, shindy, shivaree,
   spasm, spurt, stew, stir, storminess, sweat, swirl, swirling,
   tempestuousness, thunder, thunderclap, tintamarre, to-do,
   trepidation, trepidity, trouble, tumultuation, tumultuousness,
   turbidity, turbulence, turmoil, twitter, unease, unquiet, unrest,
   upheaval, uproar, upset, upturn, vortex, whirl, wildness,
   yeastiness, zeal, zealousness