HyperDicEnglishLIGHT ... light second

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Related WikiPedia: light second
English 1 sense of the expression light second:
NOUNquantitylight secondthe distance light travels in a vacuum in one second
Englishlight second: 1 sense noun 1, quantity
MeaningThe distance light travels in a vacuum in one second; approximately 300,000 kilometers.
Part oflight year, light-yearThe distance that light travels in a vacuum in 1 year
Broaderastronomy unitA linear unit used for astronomical distances

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