The Collaborative International Dictionary of English v.0.48:

fetichism \fe"tich*ism\, Fetishism \Fe"tish*ism\ (? or ?); 277),
   n.[Cf. F. f['e]tichisme.] [Written also feticism.]
   1. The doctrine or practice of belief in fetiches.
      [1913 Webster]

   2. Excessive devotion to one object or one idea; abject
      superstition; blind adoration.
      [1913 Webster]

            The real and absolute worship of fire falls into two
            great divisions, the first belonging rather to
            fetichism, the second to polytheism proper. --Tylor.
      Fetichist

The Collaborative International Dictionary of English v.0.48:

Fetish \Fe"tish\, n., Fetishism \Fe"tish*ism\ (? or ?; 277), n.,
Fetishistic \Fe`tish*is"tic\, a.
   See Fetich, n., Fetichism, n., Fetichistic, a.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fetishism
    n 1: a belief in the magical power of fetishes (or the worship
         of a fetish) [syn: fetishism, fetichism]
    2: sexual arousal or gratification resulting from handling a
       fetish (or a specific part of the body other than the sexual
       organs) [syn: fetishism, fetichism]

Moby Thesaurus II by Grady Ward, 1.0:

99 Moby Thesaurus words for "fetishism":
   Druidism, Parsiism, Sabaism, Zoroastrianism, active algolagnia,
   alchemy, algolagnia, algolagny, amphierotism, animal worship,
   autoeroticism, bewitchery, bisexuality, charm, coprophilia,
   demonism, demonolatry, devil worship, divination, enchantment,
   exhibitionism, fire worship, glamour, gramarye, heathenism,
   hero worship, heterosexuality, homoeroticism, homosexualism,
   homosexuality, hoodoo, iconoduly, iconolatry, idol worship,
   idolatrousness, idolatry, idolism, idolodulia, idolomancy,
   image worship, incest, incestuousness, juju, jujuism, lesbianism,
   magic, masochism, narcissism, natural magic, necromancy,
   necrophilia, obeah, paganism, paraphilia, passive algolagnia,
   pedophilia, phallic worship, phallicism, pyrolatry, rune, sadism,
   sadomasochism, sapphism, scotophilia, sexual inversion,
   sexual normality, sexual preference, shamanism, snake worship,
   sorcery, sortilege, spell, spellbinding, spellcasting,
   star worship, sun worship, swinging both ways, sympathetic magic,
   thaumaturgia, thaumaturgics, thaumaturgism, thaumaturgy, theurgy,
   transvestitism, tree worship, tribadism, tribady, vampirism,
   voodoo, voodooism, voyeurism, wanga, white magic, witchcraft,
   witchery, witchwork, wizardry, zooerastia, zoophilia