Adulteration (noun)

1. The act or process of making something impure or inferior by adding or mixing in other substances.
2. The addition of a foreign or inferior substance to a product, reducing its quality.

Origin:

Derived from the latin word adulterare, meaning 'to corrupt, debase, or make impure'.

Examples:

1. Adulteration of food with harmful chemicals is a serious concern.
2. The wine was found to be adulterated with cheaper substances.
3. Adulteration of fuel with cheaper substances can harm engines.
4. The spices were adulterated with fillers to increase profits.
5. The pure gold was adulterated with cheaper metals, reducing its value.