light–year
/ˈlaɪtˌjiɚ/
noun
plural
light–years
plural
light–years
Britannica Dictionary definition of LIGHT–YEAR
1
[count]
technical
:
a unit of distance equal to the distance that light travels in one year (about 5.88 trillion miles or 9.46 trillion kilometers)
2
light-years
[plural]
a
—
used to say that someone or something is much better or more advanced than others
b
—
used to refer to a time that is or seems very far away