light second

1. 1.

   the distance light travels in a vacuum in one second; approximately 300,000 kilometers

   Broaderastronomy unit

   Part oflight year

Questions about light second

What does light second mean?

light second means "the distance light travels in a vacuum in one second; approximately 300,000 kilometers".

Is light second a common word?

light second is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.