Search:   Dictionary All Posts
Store Your Knowledge at the Brain Bank!

lightyear Definition

Cancel
lightyear
noun(light-year)
a unit of length in astronomy equal to the distance that light travels in one year in a vacuum or about 5.88 trillion miles (9.46 trillion kilometers)
lightyear
noun(light-year)
an extremely large measure of comparison (as of distance, time, or quality)

Words Related to lightyear!

lightyear Examples by Brain Bank Users