/ Dictionary / Index P pollution: Meaning and Definition of Find definitions for: pol•lu•tion Pronunciation: (pu-l'shun), [key] — n. the act of polluting or the state of being polluted. the introduction of harmful substances or products into the environment: air pollution. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pollution (Thesaurus) polluted Pollux Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language