light hour

1. 1.

   the distance light travels in a vacuum in one hour; approximately one billion kilometers

   Broaderastronomy unit

   Part oflight year

Questions about light hour

What does light hour mean?

light hour means "the distance light travels in a vacuum in one hour; approximately one billion kilometers".

Is light hour a common word?

light hour 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.