Definitions for absolute magnitude
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Random House Webster's College Dictionary
ab′solute mag′nitude(n.)
the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years.
Category: Astronomy
Origin of absolute magnitude:
1900–05
Princeton's WordNet
absolute magnitude(noun)
(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
Wiktionary
absolute magnitude(Noun)
The intrinsic luminosity,x that a celestial body would have if viewed from a distance of 10 parsecs.
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"absolute magnitude." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/absolute magnitude>.