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Definition of: alteration
(ôl′tə·rā ′shən) noun
1. The act or result of altering; or the state of being altered; modification; change.
2. Geol. Any change in the composition or texture of a rock occurring subsequent to its formation but not due to a cementing or induration of its original constituents.
—adjective Of or pertaining to a geological alteration: Can alteration product. See synonyms under CHANGE.
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