light pollution: Meaning and Definition of

light' pollu"tion

Pronunciation: [key]
  1. unwanted or harmful light, as from bright street lights or neon signs.
  2. artificial illumination of the sky that sets a limit on the faintness of stars that can be observed or photographed.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.