the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors
(contaminate) pollute: make impure; "The industrial wastes polluted the lake"
(contaminating) dirty: spreading pollution or contamination; especially radioactive contamination; "the air near the foundry was always dirty"; "a dirty bomb releases enormous amounts of long-lived radioactive fallout"
(contaminating) corrupting: that infects or taints
Contamination is the presence of a minor and unwanted constituent (contaminant) in material, physical body, natural environment, at a workplace, etc.
Contamination is a 1996 album by Belgian electro-industrial act Suicide Commando.
Contamination (also known as Alien Contamination, Contamination: Alien on Earth and Toxic Spawn) is a 1980 science fiction horror film directed by Lewis Coates and starring Ian McCulloch.
"Contamination is the eleventh episode from the second season of Grey's Anatomy spin-off show, Private Practice. The episode aired on January 8, 2009 in the United States on ABC.
(Contaminants) Pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms. Pollution can take the form of chemical substances or energy, such as noise, heat, or light. ...
The act or process of contaminating; pollution; defilement; taint; also, that which contaminates; A process whereby words with related meanings come to have similar sounds; The process of making a material or surface unclean or unsuited for its intended purpose, usually by the addition or ...
(contaminate) To introduce impurities or foreign matter; to soil or defile
(Contaminations) Every day, vehicle paint finishes are bombarded with a wide variety of airborne contaminants. ...
(Contaminants) are substances that have an adverse effect on the air, water, or soil.
(CONTAMINANTS) The general name for any microparticle or organism which reduces water clarity, quality or presents health hazards. Filtering, oxidising and sanitising are necessary to destroy the contaminants.
(Contaminants) any physical, chemical, biological, or radiological substance or material in the water.
(CONTAMINANTS) As you drive, or leave your car outside and uncovered, your car's paint collects dirt, grime, bird droppings, bug splats, water deposits, tar, oil and other substances. These substances contaminate your paint, reducing its brilliance and smooth feel. ...
(Contaminants) Any polish, wax, tree sap, tar, oil or the like that would damage the paint film or spoil the adhesion of a new paint film.
(Contaminants) Both natural and artificial materials not typically found or found in unusually high concentrations which can be detrimental to the health of wild or farmed aquatic species
(Contaminants) Constituents added to the water supply through use. 
(Contaminants) Foreign materials such as dirt, dust or oil that can be detected in the cured powder film.
(Contaminants) Taste and odor, rust and sediments, bacteria or parasites, lead and other metal products.
(Contaminants) any unacceptable or unintended trace materials.
(Contaminants) anything that makes something else impure or unclean through contact or mixture; may include natural (arsenic or radon) or man-made (polychlorinated biphenyls [PCBs]) elements.