Webster's English Dictionary

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oxidation

ox.i.da.tion \.a:k-s*-'da--sh*n\ \'a:k-s*-.da-t-iv\ n [F, fr. oxider, 
   oxyder to oxidize, fr. oxide] 1: the act or process of oxidizing  2: the 
   state or result of being oxidized  - ox.i.da.tive aj