Absolute Magnitude Definition

noun
The intrinsic brightness of a celestial body, measured in magnitudes, computed as if viewed from a distance of 10 parsecs, or 32.6 light years.
American Heritage
The apparent magnitude a star would have at a distance of ten parsecs from the observer.
Webster's New World

(astronomy) The intrinsic luminosity that a celestial body would have if viewed from a distance of 10 parsecs or 32.6 light years.

Wiktionary

Other Word Forms of Absolute Magnitude

Noun

Singular:
absolute magnitude
Plural:
absolute-magnitudes

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