Advertisement

light-year (n.)

also lightyear, "distance light travels in one year" (about 5.87 trillion miles), 1888, from light (n.) + year.

Others Are Reading

Advertisement
Definitions of light-year from WordNet

light-year (n.)
the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers;
Synonyms: light year
From wordnet.princeton.edu