absolute magnitude is a noun meaning "(astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth". It carries one recorded sense.
(astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth
astronomy
Definitions, synonyms and semantic relations for absolute magnitude come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.