Definition of light-years away
- A cure for that disease is still probably light-years away.
: a unit of length in astronomy equal to the distance that light travels in one year in a vacuum or about 5.88 trillion miles (9.46 trillion kilometers)
: an extremely large measure of comparison (as of distance, time, or quality)
: on the way : along
: from this or that place
: in a secure place or manner
: absent from a place : gone
: distant in space or time
: played on an opponent's grounds
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