Definition of impurity noun from the Oxford Advanced Learner's Dictionary

     

    impurity

     noun
    noun
    BrE BrE//ɪmˈpjʊərəti//
     
    ; NAmE NAmE//ɪmˈpjʊrəti//
     
    (pl. impurities)
     
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  1. 1[countable] a substance that is present in small amounts in another substance, making it dirty or of poor quality A filter will remove most impurities found in water. The substance is free of impurities. The water contains impurities which make it unsuitable for drinking.
  2. 2[uncountable] the state of being dirty or not pure opposite purity
  3. Word Origin late Middle English: from French impurite or Latin impuritas, from impurus, from in- ‘not’ + purus ‘pure’.
See the Oxford Advanced American Dictionary entry: impurity