The act of depraving, or making anything bad; the act of corrupting.
Detraction; depreciation.
The state of being depraved or degenerated; degeneracy; depravity.
Change for the worse; deterioration; morbid perversion.
Moral or spiritual corruption; impurity, degradation, defilement.
Physical contamination, now especially the contamination of the environment by harmful substances, or by disruptive levels of noise, light etc.
Something that pollutes; a pollutant.