one-way light time is a noun meaning "the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object". It carries one recorded sense.
the elapsed time it takes for light (or radio signals) to travel between the Earth and a celestial object
Definitions, synonyms and semantic relations for one-way light time come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.