Meaning Of The Word Light year

Real Dictionary

What's the definition of Light year? Find Light year meanings, definitions and more at the Real Dictionary online.

Light year Meaning

Light year Definition
Light year Definition

What's The Definition Of Light year?

light year
countable noun: A light year is the distance that light travels in a year.

light year in British English
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)
noun: 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

light-year in American English
noun: 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

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