The act or process of infecting.
A disease caused by a pathogen.
An uncontrolled growth of harmful microorganisms in a host.
A visible sign of such a disease, such as the suppuration of a wound.
Something that pollutes; a pollutant.
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.