Light-year meaning

lītyir
Frequency:
The distance that light travels in a vacuum in one year, equal to about 9.46 trillion km (5.88 trillion mi). Light-years are used in measuring interstellar and intergalactic distances.
5
1
The definition of a light-year is the unit for measuring the distance that light travels in one year, or is a long time or a great distance.

An example of a light-year is over five trillion miles.

An example of a light-year is how far ahead one child may be in class when compared to another child; light-years ahead.

noun
1
1
The distance light travels in one year, which is approximately 5.9 quadrillion miles. Abbreviated "ly," light years are used to measure distances in the universe. For example, the galaxy is presumed to be about 100 ly across. Proxima Centauri, at about 4.22 ly from the sun, is the closest star to the sun.It's About Distance, Not TimeBecause the word "year" is used, light years are often erroneously used to measure time. The phrase "I spent light years doing that" might sound triumphant, but it is like saying "I spent a million miles doing that."
1
1
A very great distance, amount of time, etc.

Light-years ahead in basic research.

noun
0
1
Alternative spelling of light year.
noun
0
1
Advertisement
The distance that light travels in a vacuum in one year, approximately 9.46 trillion kilometers (5.88 trillion miles).
noun
0
2
(informal) A long way.

A small town light years away from the action of the capital.

noun
0
2
(astron.) A unit of distance equal to the distance that light travels in a vacuum in one year, c. 9,460,000,000,000 km (5,880,000,000,000 mi)
noun
0
2