- luminance (def. 2).
- the quality of being intellectually brilliant, enlightened, inspired, etc.: The luminosity of his poetry is unequaled.
- something luminous.
- the brightness of a star in comparison with that of the sun: the luminosity of Sirius expressed as 23 indicates an intrinsic brightness 23 times as great as that of the sun.
- the brightness of a light source of a certain wavelength as it appears to the eye, measured as the ratio of luminous flux to radiant flux at that wavelength.
- the condition of being luminous
- something that is luminous
- a measure of the radiant power emitted by a star
- the attribute of an object or colour enabling the extent to which an object emits light to be observed
