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Collins Concise English Dictionary © HarperCollins Publishers:: light year n - a unit of distance used in astronomy, equal to the distance travelled by light in one year, i.e. 9.4607 × 1012 kilometres or 0.3066 parsecs
ˈlight-ˌyear, n. [countable]- Astronomythe distance that light can travel in one year, about 5.88 trillion mi. (9.46 trillion km);
it is used as a unit in measuring distances among stars. - light-years, [plural]
- a very great measure of comparison:Today's computers are light-years ahead of older ones in power and memory.
- a very long time:Vacation already seemed light-years away.
WordReference Random House Unabridged Dictionary of American English © 2024light-year (līt′yēr′, -yēr′),USA pronunciation n. - Astronomythe distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km): used as a unit in measuring stellar distances. Abbr.: lt-yr
- light-years:
- a very great distance, esp. 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.
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