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The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word year, the term light-year is sometimes misinterpreted as a unit of time.
Meaning: The distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers. Classified under: Nouns denoting quantities and units of measure. Synonyms: light year; light-year. Hypernyms (light-year is a kind of...): astronomy unit (a linear unit used for astronomical distances) Meronyms (parts of light-year): light hour (the distance light travels in a vacuum in one hour; approximately one billion kilometers) light minute (the distance light travels in a vacuum in one minute; approximately 18 million kilometers)