light-year

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.

Similar
light year
Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

nounlight-year (plural light-years)

plural light-years

  1. alternativeAlternative spelling of light year.

Synonyms & antonyms

nounthe distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

Similar
light year
Broader
astronomy unit
Also see
light year

Synonym sets from Open English WordNet, CC BY 4.0.

Cite this entry
APA

light-year. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/light-year

MLA

“light-year.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/light-year. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “light-year,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/light-year.

Source: light-year on Wiktionary, CC BY-SA 4.0.