n. the state of being luminous, or a luminous object; brilliance or radiance
n. the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
n. the rate at which a star radiates energy in all directions
the GNU version of the Collaborative International Dictionary of English
n. The quality or state of being luminous; luminousness.
The Century Dictionary and Cyclopedia
n. The quality of being luminous or bright; luminousness; the radiation or reflection of light.
n. Specifically, the intensity of light in a color, measured photometrically.
n. In botany, phosphorescence.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the quality of being luminous; emitting or reflecting light
Word Usage
"The word luminosity describes the nature of celestial light, and the music of composer James Whitbourn is a celebration of that light: peaceful, radiant and clear."