LookItUp

light year

Meaning in simple English, pronunciation and examples

Pronunciation: US /ˈlaɪt ˌjɪr/ · UK /ˈlaɪt ˌjɪə/

light year means: The distance that light travels in one year, used to measure how far away stars and galaxies are.

noun

SPACE DISTANCEB2

The distance that light travels in one year, used to measure how far away stars and galaxies are.

  • That star is four light years away.
  • Astronomers measure huge distances in light years.
  • How many light years separate these two galaxies?

Common phrases: one light year, a light year away

HUGE GAPC1

A very large distance or difference, especially between how good or advanced two things are.

  • Their team is light years ahead of ours.
  • The new camera is light years better than my old one.
  • Her first draft was light years away from the finished book.

How to use it: light years ahead of someone/something (Their technology is light years ahead of ours.); light years away from something (This plan is light years away from what we need.)

Common phrases: a light year ahead, a light year behind

LONG TIMEC1

A very long period of time, used with deliberate exaggeration.

  • That summer feels light years ago.
  • A week in that job felt like a light year.
  • By then, light years seemed to have passed since our last meeting.

Similar words: age, eternity

Common phrases: a light year ago, a light year later

Questions about light year

What does light year mean?

The distance that light travels in one year, used to measure how far away stars and galaxies are.

What is light year in other languages?

Türkçe: ışık yılı · Español: año luz · Français: année-lumière · Deutsch: Lichtjahr · Italiano: anno luce · 日本語: 光年

How do you pronounce light year?

In American English /ˈlaɪt ˌjɪr/; in British English /ˈlaɪt ˌjɪə/.

How do you use light year in a sentence?

That star is four light years away. Astronomers measure huge distances in light years.

Learn light year while you read

LookItUp shows the meaning that fits your sentence, in your language, and turns new words into quick practice cards.

Coming soon on the App Store LookItUp app for iPhone and iPad

light year in other languages

More words