definition of
pollution

[1] #1 pollution n. undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities. wn

[2] #2 pollution n. [befoulment, defilement] the state of being polluted. wn

[3] #3 pollution n. [contamination] the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors. wn