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absolute magnitude

noun

Astronomy.
  1. the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years.

absolute magnitude

noun

  1. the apparent magnitude a given star would have if it were situated at a distance of 10 parsecs (32.6 light years) from the earth
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

absolute magnitude

  1. See under at magnitude
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Word History and Origins

Origin of absolute magnitude1

First recorded in 1900–05
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