luminousness
lu·mi·nous·ness
noun
1.
the quality of being luminous; emitting or reflecting light
- “its luminosity is measured relative to that of our sun”
Origin
From luminous + -ness.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.