Light Year

distance that light travels in 1 year (approximately 9.46 trillion kilometers or 5.88 trillion miles); very far away

A light-year or lightyear (symbol: ly) is a unit of measurement of length, specifically the distance that light travels in a vacuum in one year. While there is no authoritative decision on which year is used, the International Astronomical Union (IAU) recommends the Julian year.
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Noun
1. the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers
(hypernym) astronomy unit
(part-meronym) light hour

The distance travelled by electromagnetic radiation in a year. It is equivalent to 9.46 x 1012 km. See parsec.

Synonyms and related words:
aesthetic distance, astronomical unit, celestial spaces, chaos, clearance, compass, cosmic space, deep space, depths of space, distance, divergence, empty space, ether space, extent, farness, infinity, interstellar space, leeway, length, light-years, margin, metagalactic space, mileage, ocean of emptiness, outer space, parsec, parsecs, perspective, piece, pressureless space, range, reach, remoteness, separation, space, span, stretch, stride, the void, the void above, way, ways