Meaning of light-year
Pronunciation: (līt'yēr", -yēr'), [key]
- the 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
- The new computer is light-years ahead of the old one.
- 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.
- light-year (Thesaurus)