'Pollution' definitions:

Definition of 'pollution'

From: WordNet
noun
Undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
noun
The state of being polluted [syn: befoulment, defilement, pollution]
noun
The act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors [syn: contamination, pollution] [ant: decontamination]

Definition of 'Pollution'

From: GCIDE
  • Pollution \Pol*lu"tion\, n. [L. pollutio: cf. F. pollution.]
  • 1. The act of polluting, or the state of being polluted (in any sense of the verb); defilement; uncleanness; impurity. [1913 Webster]
  • 2. (Med.) The emission of semen, or sperm, at other times than in sexual intercourse. --Dunglison. [1913 Webster]