LIGHT-YEAR


Meaning of LIGHT-YEAR in English

noun Date: 1888 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), an extremely large measure of comparison (as of distance, time, or quality)

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.