Science Dictionary
oxidation   (ŏk'sĭ-dā'shən)  Pronunciation Key 
  1. The chemical combination of a substance with oxygen.

  2. A chemical reaction in which an atom or ion loses electrons, thus undergoing an increase in valence. Removing an electron from an iron atom having a valence of +2 changes the valence to +3. Compare reduction.

oxidative adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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