Definition of light-year
1
:a unit of length in astronomy equal to the distance that light travels in one year in a vacuum or about 5.88 trillion miles (9.46 trillion kilometers)
2
:an extremely large measure of comparison (as of distance, time, or quality)
- seems like light-years ago
- has light-years more talent
- two minutes and yet light-years away from the crowded village
- —Suzanne Patterson
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