ALL meanings of light year
light year
L l - noun light year astronomy: measure of distance 1
- noun light year Astronomy. 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. Abbreviation: lt-yr. 1
- noun light year light-years. 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. 1
- countable noun light year A light year is the distance that light travels in a year. 0
- countable noun light year You can say that two things are light years apart to emphasize a very great difference or a very long distance or period of time between them. 0
- noun light year 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 0
- noun light year a unit of distance equal to the distance that light travels in a vacuum in one year, c. 9,460,000,000,000 km (5,880,000,000,000 mi) 0
- noun light year a very great distance, amount of time, etc. 0
- noun light year (astronomy) A unit of length (abbreviation ly; equal to just under 10 trillion kilometres (1016 metres)) equal to the distance light travels in one Julian year; used to measure extremely large distances. 0
- noun light year (Informal) (in plural light years; figurative) A very long way. 0
- noun light year (in plural light years; figurative, informal, nonstandard) A very long time. 0