light-year
noun
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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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More Definitions for light-year
light-year
noun
English Language Learners Definition of light-year
: a unit of distance equal to the distance that light travels in one year (about 5.88 trillion miles or 9.46 trillion kilometers)
light-years —used to say that someone or something is much better or more advanced than others
—used to refer to a time that is or seems very far away
See the full definition for light-year in the English Language Learners Dictionary
light-year
nounKids Definition of light-year
: a unit of length in astronomy equal to the distance that light travels in one year or about 5.88 trillion miles (9.46 trillion kilometers)
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