The Collaborative International Dictionary of English v.0.48:

Appetite \Ap"pe*tite\, n. [OE. appetit, F. app['e]tit, fr. L.
   appetitus, fr. appetere to strive after, long for; ad +
   petere to seek. See Petition, and cf. Appetence.]
   1. The desire for some personal gratification, either of the
      body or of the mind.
      [1913 Webster]

            The object of appetite it whatsoever sensible good
            may be wished for; the object of will is that good
            which reason does lead us to seek.    --Hooker.
      [1913 Webster]

   2. Desire for, or relish of, food or drink; hunger.
      [1913 Webster]

            Men must have appetite before they will eat.
                                                  --Buckle.
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   3. Any strong desire; an eagerness or longing.
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            It God had given to eagles an appetite to swim.
                                                  --Jer. Taylor.
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            To gratify the vulgar appetite for the marvelous.
                                                  --Macaulay.
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   4. Tendency; appetency. [Obs.]
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            In all bodies there as an appetite of union.
                                                  --Bacon.
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   5. The thing desired. [Obs.]
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            Power being the natural appetite of princes.
                                                  --Swift.
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   Note: In old authors, appetite is followed by to or of, but
         regularly it should be followed by for before the
         object; as, an appetite for pleasure.
         [1913 Webster]

   Syn: Craving; longing; desire; appetency; passion.
        [1913 Webster]

WordNet (r) 3.0 (2006):

appetite
    n 1: a feeling of craving something; "an appetite for life";
         "the object of life is to satisfy as many appetencies as
         possible"- Granville Hicks [syn: appetite, appetency,
         appetence]

Moby Thesaurus II by Grady Ward, 1.0:

174 Moby Thesaurus words for "appetite":
   Cyrenaic hedonism, Cyrenaicism, alacrity, an universal wolf,
   animation, animus, anxiety, anxiousness, appetence, appetency,
   appetition, appetitiveness, avidity, avidness, bent, bias,
   breathless impatience, canine appetite, cannibalism, carnivorism,
   carnivority, carnivorousness, cheerful readiness, chewing, choice,
   command, conation, conatus, consumption, coveting, craving,
   cropping, cupidity, decision, deglutition, demand, desire,
   determination, devouring, devourment, dieting, dining, discretion,
   disposition, drought, dryness, eagerness, eating, edacity, elan,
   emptiness, empty stomach, enthusiasm, epicureanism, epicurism,
   epulation, ethical hedonism, fancy, feasting, feeding, flair,
   fondness, forwardness, free choice, free will, gluttony, gobbling,
   gourmandise, grazing, greed, gust, gusto, hankering,
   hedonic calculus, hedonics, hedonism, herbivorism, herbivority,
   herbivorousness, hollow hunger, hunger, hungriness, impatience,
   inclination, ingestion, intention, itch, itching, keen desire,
   keenness, leaning, licking, life, liking, liveliness, longing,
   love, lust, luxuriousness, luxury, manducation, mania, mastication,
   messing, mind, munching, nibbling, nutrition, objective,
   omnivorism, omnivorousness, omophagy, pantophagy, passion, pasture,
   pasturing, pecking, penchant, pleasure, pleasure principle,
   pleasure-seeking, polydipsia, predilection, preference, proclivity,
   promptness, propensity, prurience, pruriency,
   psychological hedonism, quickness, readiness, regalement, relish,
   relishing, resolution, rumination, savoring, sensualism,
   sensuality, sensualness, sexual desire, soft spot, spirit, stomach,
   sweet tooth, sybaritism, tapeworm, taste, tasting, tendency,
   thirst, thirstiness, torment of Tantalus, unchastity, urge,
   urgency, vegetarianism, velleity, verve, vitality, vivacity,
   volition, voluptuousness, voracity, weakness, will, will power,
   wish, wolfing, yearning, zeal, zest, zestfulness



The Devil's Dictionary (1881-1906):

APPETITE, n.  An instinct thoughtfully implanted by Providence as a
solution to the labor question.