oxidation
  • noun a chemical reaction in which a substance combines with oxygen with loss of electrons
  • A chemical reaction in which an atom, molecule, ion, or radical combines with oxygen. For instance, iron combining with oxygen to form iron oxide.
  • A chemical reaction in which an atom, molecule, ion, or radical loses one or more electrons. For example, a reaction in which iron combines with oxygen, where the iron undergoes a change in valence from 0 to +3.

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