/looh'meuh nos"i tee/, n., pl. luminosities.
1. luminance (def. 2).
2. the quality of being intellectually brilliant, enlightened, inspired, etc.: The luminosity of his poetry is unequaled.
3. something luminous.
4. Astron. 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.
5. Also called luminosity factor. Optics. 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.
[1625-35; < L luminos(us) LUMINOUS + -ITY]

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Universalium. 2010.

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