unwanted or harmful light, as from bright street lights or neon signs.
Astronomy. artificial illumination of the sky that sets a limit on the faintness of stars that can be observed or photographed.
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Origin of light pollution
First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for light pollution
the glow from street and domestic lighting that obscures the night sky and hinders the observation of faint stars
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012