noun🔗ShareA 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."Astronomers estimate that the galaxy is about 100,000 ly across. "astronomyphysicsspaceunitsciencemathChat with AIVocabulary GamePractice Reading
noun🔗Share(only in plural) A very long way."The marathon runner in the lead is light years ahead of the one at the back."wayspaceplaceChat with AIVocabulary GamePractice Reading
noun🔗Share(only in plural) A very long time."Some of Leonardo da Vinci’s inventions were light years ahead of their time."timepastChat with AIVocabulary GamePractice Reading
