- 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.
Origin of light pollution
First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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