[loo-muh-nos-i-tee] 
| 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. | Astronomy. 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. |
| lu·mi·nos·i·ty (lōō'mə-nŏs'ĭ-tē) n. pl. lu·mi·nos·i·ties
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məˈnɒs