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contamination

con·tam·i·na·tion [ kən tàmmi náysh'n ]


noun 
Definition:
 
1. act of contaminating something: the act or process of contaminating something or becoming contaminated, or the unclean or impure state that results from this

2. something that contaminates: something that physically contaminates a substance or that corrupts a person morally
The investigators found considerable contamination in the rivers.

3. alteration of word or phrase: the process by which a word or phrase changes as a result of mistaken association with another word or phrase

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