Definition of absolute magnitude noun from the Oxford Advanced Learner's Dictionary


absolute magnitude

BrE BrE//ˌæbsəluːt ˈmæɡnɪtjuːd//
; NAmE NAmE//ˌæbsəluːt ˈmæɡnɪtuːd//
[uncountable] (astronomy)
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a measure of how bright a star, planet, etc. is, as it would be seen at a standard distance from the earth compare apparent magnitude
See the Oxford Advanced American Dictionary entry: absolute magnitude