lightyear

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A form of light year — A unit of length used to measure extremely large distances, equal to approximately 9.46 trillion kilometres 10 trillion kilometres (10¹⁶ metres), equivalent to the distance light travels in one Julian year.

Less commonScrabble 16
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Meanings

nounlightyear (plural lightyears)

plural lightyears

  1. alternativeAlternative spelling of light year.

Synonyms & antonyms

Also see
ly
Cite this entry
APA

lightyear. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/lightyear

MLA

“lightyear.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/lightyear. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “lightyear,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/lightyear.

Source: lightyear on Wiktionary, CC BY-SA 4.0.