Definition of lightyear

"lightyear" is probably misspelled. Trying light_year instead Definition of light_year

1. light_year [ n ] the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

Used in print:

(Philip Jos‚ Farmer, The Lovers....)

I can n't tell you now the distance in light_years or what star this was , though you can see it with the naked eye at night in this hemisphere .

Synonyms light_year Related Terms astronomy_unit light_second light_minute light_hour