1. The combination of a substance with oxygen.
2. A reaction in which the atoms in an element lose electrons and the valence of the element is correspondingly increased.

Excerpted from The American Heritage Dictionary of the English Language, Third Edition Copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V., further reproduction and distribution restricted in accordance with the Copyright Law of the United States. All rights reserved.

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