The Collaborative International Dictionary of English v.0.48:

Oxidation \Ox`i*da"tion\, n. [Cf. F. oxidation.] (Chem.)
   The act or process of oxidizing, or the state or result of
   being oxidized.
   [1913 Webster]

WordNet (r) 3.0 (2006):

oxidation
    n 1: the process of oxidizing; the addition of oxygen to a
         compound with a loss of electrons; always occurs
         accompanied by reduction [syn: oxidation, oxidization,
         oxidisation]

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "oxidation":
   acetification, acidification, acidulation, alkalization,
   biodegradability, biodegradation, blazing, blistering, branding,
   breakup, burning, calcination, carbonation, carbonization,
   catalysis, cauterization, cautery, chemicalization, cineration,
   combustion, concremation, corrosion, corruption, cracking,
   cremation, cupellation, decay, decomposition, deflagration,
   degradability, degradation, destructive distillation, dilapidation,
   disintegration, disorganization, dissolution, distillation,
   distilling, electrolysis, ferment, fermentation, flaming,
   hydrogenation, incineration, isomerism, metamerism, metamerization,
   mildew, mold, nitration, oxidization, parching, phosphatization,
   polymerism, polymerization, position isomerism, pyrolysis,
   reduction, refining, resolution, rust, saturization, scorching,
   scorification, searing, self-immolation, singeing, smelting,
   spoilage, suttee, the stake, thermogenesis, vesication, working