- a very great distance, especially in development or progress: The new computer is light-years ahead of the old one.
- a very long time: It's been light-years since I've seen my childhood friends.
Origin of light-year
Examples from the Web for light-year
Bearings agree, and distances check to within a light-year, which is as close as we can hope to check on as small a mass as a man.Skylark Three|Edward Elmer Smith
One could imagine falling forty-two thousand miles, where one couldn't imagine falling a light-year.Pariah Planet|Murray Leinster
In popular writings, another unit: a light-year, has for a very long time been employed.Lectures on Stellar Statistics|Carl Vilhelm Ludvig Charlier
By your figuring, we shouldn't be yet one light-year on the way.Out Around Rigel|Robert H. Wilson
That expedition perished after less than a light-year when its hydroponics system failed.Control Group|Roger Dee