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luminosity

lu·mi·nos·i·ty [ lmə nóssətee ] (plural lu·mi·nos·i·ties)


noun 
Definition:
 
1. state of being luminous: the state or quality of being luminous

2. energy radiated by astronomical object: the energy radiated per second by an astronomical object.
Symbol  L


3. strength of light emitted: the visual perception of the extent to which an object emits light

4. something luminous: something that emits light

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