light second

noun

A unit of length equal to the distance light travels in one second: about 300 megameters

Ask AI about this wordChatGPTClaudePerplexityGoogle AIGrok

Meanings

nounlight second (plural light seconds)

plural light seconds

  1. astronomyA unit of length equal to the distance light travels in one second: about 300 megameters
Cite this entry
APA

light second. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/light%20second

MLA

“light second.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/light%20second. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “light second,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/light%20second.

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