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ALAN

From Wiktionary, the free dictionary
See also: Appendix:Variations of "alan"

English

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Noun

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ALAN (uncountable)

  1. Initialism of artificial light at night.
    • 2021 March 16, Mattias Green, Yueng-Djern Lenn, 30-Second Oceans: 50 Key Ideas about the Sea's Importance to Life on Earth, 30 Second, →ISBN:
      Skyglow is a form of artificial light at night (ALAN) whereby the atmosphere scatters light back to Earth, creating a glowing dome of diffused light that can extend hundreds of kilometres into the sea.
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