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1. Undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
    
2. The state of being polluted
   - befoulment, defilement
    
3. The act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors
   - contamination

Derived forms: pollutions

See also: antipollution, pollute

Type of: dirtiness, dirtying, environmental condition, impureness, impurity, soiling, soilure, uncleanness

Encyclopedia: Pollution