the act or process of corroding; condition of being corroded.
a product of corroding, as rust.

1350–1400; Middle English (< Middle French) < Late Latin corrōsiōn- (stem of corrōsiō) a gnawing away, equivalent to Latin corrōs(us), past participle of corrōdere to corrode + -iōn- -ion

corrosional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
corrosion (kəˈrəʊʒən)
1.  a process in which a solid, esp a metal, is eaten away and changed by a chemical action, as in the oxidation of iron in the presence of water by an electrolytic process
2.  slow deterioration by being eaten or worn away
3.  the condition produced by or the product of corrosion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1400, from O.Fr. corrosion, from L. corrosionem, noun of action from corrodere (see corrode).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
corrosion   (kə-rō'zhən)  Pronunciation Key 
The breaking down or destruction of a material, especially a metal, through chemical reactions. The most common form of corrosion is rusting, which occurs when iron combines with oxygen and water.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The composite is more resistant to corrosion than the steel it replaces, is
  easier to clean and floats.
The sensors track temperature, humidity and corrosion rate.
The cracks made the engines vulnerable to corrosion from seawater and rainwater.
The kind of seal required will depend on the stress and corrosion it has to
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