1 the act of polluting or the state of being polluted
2 harmful or poisonous substances introduced into an environment
n the glow from street and domestic lighting that obscures the night sky and hinders the observation of faint stars
n annoying or harmful noise in an environment
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"