noun Download 🔗Share A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (1016 metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances. Examples : "Astronomers estimate that the galaxy is about 100,000 ly across. " astronomy physics space unit science math Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share (only in plural) A very long way. Examples : "The marathon runner in the lead is light years ahead of the one at the back." way space place Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share (only in plural) A very long time. Examples : "Some of Leonardo da Vinci’s inventions were light years ahead of their time." time past Chat with AIVocabulary GamePractice Reading