light–year

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light–year /ˈlaɪtˌjiɚ/ noun
plural light–years
light–year
/ˈlaɪtˌjiɚ/
noun
plural light–years
Learner's definition of LIGHT–YEAR
[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)
light-years [plural]
used to say that someone or something is much better or more advanced than others
used to refer to a time that is or seems very far away