American English

Definition of impurity noun from the Oxford Advanced American Dictionary



    (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.
  2. 2[uncountable] the state of being dirty or not pure opposite purity
See the Oxford Advanced Learner's Dictionary entry: impurity