The Collaborative International Dictionary of English v.0.48:

Agitation \Ag`i*ta"tion\, n. [L. agitatio: cf. F. agitation.]
   1. The act of agitating, or the state of being agitated; the
      state of being moved with violence, or with irregular
      action; commotion; as, the sea after a storm is in
      agitation.
      [1913 Webster]

   2. A stirring up or arousing; disturbance of tranquillity;
      disturbance of mind which shows itself by physical
      excitement; perturbation; as, to cause any one agitation.
      [1913 Webster]

   3. Excitement of public feeling by discussion, appeals, etc.;
      as, the antislavery agitation; labor agitation. "Religious
      agitations." --Prescott.
      [1913 Webster]

   4. Examination or consideration of a subject in controversy,
      or of a plan proposed for adoption; earnest discussion;
      debate.
      [1913 Webster]

            A logical agitation of the matter.    --L'Estrange.
      [1913 Webster]

            The project now in agitation.         --Swift.
      [1913 Webster]

   Syn: Emotion; commotion; excitement; trepidation; tremor;
        perturbation. See Emotion.
        [1913 Webster]

WordNet (r) 3.0 (2006):

agitation
    n 1: a mental state of extreme emotional disturbance
    2: a state of agitation or turbulent change or development; "the
       political ferment produced new leadership"; "social unrest"
       [syn: agitation, ferment, fermentation,
       tempestuousness, unrest]
    3: the feeling of being agitated; not calm [ant: calmness]
    4: disturbance usually in protest [syn: agitation,
       excitement, turmoil, upheaval, hullabaloo]
    5: the act of agitating something; causing it to move around
       (usually vigorously)

Moby Thesaurus II by Grady Ward, 1.0:

190 Moby Thesaurus words for "agitation":
   ado, aggravation, all-overs, angst, animation, anxiety,
   anxiety hysteria, anxiety neurosis, anxious bench, anxious concern,
   anxious seat, anxiousness, apprehension, apprehensiveness, arousal,
   arousing, attack of nerves, bluster, bother, botheration, brawl,
   broil, brouhaha, buck fever, burst, bustle, cacophony,
   cankerworm of care, care, case of nerves, chaos, chills of fear,
   churning, cold creeps, cold shivers, cold sweat, commotion,
   concern, concernment, confusion, creeps, disquiet, disquietude,
   distress, disturbance, dither, dread, ebullience, ebullition, eddy,
   effervescence, electrification, embroilment, exacerbation,
   exasperation, excessive irritability, excitation, excitement,
   exhilaration, fanaticism, fear, fear and trembling, feery-fary,
   ferment, fermentation, fidgetiness, fidgets, firing, fit, flap,
   flurry, fluster, flutter, flutteriness, fomentation, foofaraw,
   foreboding, forebodingness, frenzy, fume, furor, furore, fury,
   fuss, fussiness, galvanization, goose bumps, gooseflesh,
   heartquake, horripilation, hubbub, hullabaloo, hurly-burly, hurry,
   hurry-scurry, incitation, incitement, inflammation, infuriation,
   inquietude, instigation, irritation, jimjams, lather, lathering up,
   maelstrom, malaise, misgiving, morbid excitability, nerves,
   nervosity, nervous stomach, nervous strain, nervous tension,
   nervousness, overanxiety, palpitation, pandemonium, panic,
   panickiness, passion, pell-mell, pep rally, pep talk, perturbation,
   pins and needles, pother, provocation, pucker, quaking,
   quiver of terror, rabble-rousing, racket, rage, restlessness, row,
   ruckus, ruffle, rumpus, scramble, shaking, shivers, solicitude,
   spasm, spell of nerves, spurt, stage fright, state of nerves,
   steaming up, stew, stimulation, stimulus, stir, stirring,
   stirring up, stirring-up, storminess, strain, suspense, sweat,
   swirl, swirling, tempestuousness, tension, thrill of fear, tic,
   to-do, trepidation, trepidity, trouble, tumult, tumultuousness,
   turbulence, turmoil, twitching, uneasiness, unquiet, unquietness,
   uproar, upset, vellication, vexation, vortex, whipping up, whirl,
   wildness, working up, yeastiness, zeal, zealousness