Light Year Definition

lītyir
light-years
noun
light-years
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)
Webster's New World
A very great distance, amount of time, etc.
Light-years ahead in basic research.
Webster's New World
A long way.
A small town light years away from the action of the capital.
American Heritage
Alternative spelling of light year.
Wiktionary
Synonyms:

Other Word Forms of Light Year

Noun

Singular:
light year
Plural:
light-years

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