1. the action of making something impure by adding inferior or harmful substances
2. the state of being made impure or inferior by the addition of foreign substances

Examples

• The adulteration of milk with water was discovered during routine testing.
• Food safety inspectors found evidence of adulteration in the imported spices.
• The company was fined for the adulteration of their olive oil with cheaper vegetable oils.
• Ancient laws prohibited the adulteration of wine with foreign substances.
• The adulteration of medications poses serious health risks to patients.
• Laboratory tests revealed extensive adulteration of the honey samples.
• Strict regulations prevent the adulteration of organic products.