/ ɪmˈpjʊərəti; NAmE -ˈpjʊr-/ noun ( pl. -ies )
1.
[ C ] 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.
[ U ] the state of being dirty or not pure
OPP purity
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WORD ORIGIN
late Middle English : from French impurite or Latin impuritas , from impurus , from in- not + purus pure.