light year (35 synonym found)

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Definition of light year:

(n) : a unit of length (abbreviation ly) equal to the distance light travels in one year; used to measure extremely large distances; (in plural light years; figurative, informal) A very long way
"the marathon runner in the lead is light years ahead of the one at the back."
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Definition of light year:

(n) : a unit of length (abbreviation ly) equal to the distance light travels in one year; used to measure extremely large distances; (in plural light years; figurative, informal) A very long way
"the marathon runner in the lead is light years ahead of the one at the back."
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