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3 definitions found
 for luminousness
From The Collaborative International Dictionary of English v.0.48 :

  luminousness \lu"mi*nous*ness\ n.
     the quality of being luminous; emitting or reflecting light.
  
     Syn: luminosity, luminance, light.
          [WordNet 1.5]

From The Collaborative International Dictionary of English v.0.48 :

  Luminous \Lu"mi*nous\, a. [L. luminosus, fr. lumen light: cf. F.
     lumineux. See Luminary, Illuminate.]
     [1913 Webster]
     1. Shining; emitting or reflecting light; brilliant; bright;
        as, the is a luminous body; a luminous color.
        [1913 Webster]
  
              Fire burneth wood, making it . . . luminous.
                                                    --Bacon.
        [1913 Webster]
  
              The mountains lift . . . their lofty and luminous
              heads.                                --Longfellow.
        [1913 Webster]
  
     2. Illuminated; full of light; bright; as, many candles made
        the room luminous.
        [1913 Webster]
  
              Up the staircase moved a luminous space in the
              darkness.                             --Longfellow.
        [1913 Webster]
  
     3. Enlightened; intelligent; also, clear; intelligible; as, a
        luminous mind. " Luminous eloquence." --Macaulay. " A
        luminous statement." --Brougham.
        [1913 Webster]
  
     Luminous paint, a paint made up with some phosphorescent
        substance, as sulphide of calcium, which after exposure to
        a strong light is luminous in the dark for a time.
        [1913 Webster]
  
     Syn: Lucid; clear; shining; perspicuous.
          [1913 Webster] -- Lu"mi*nous*ly, adv. --
          Lu"mi*nous*ness, n.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

  luminousness
      n 1: the quality of being luminous; emitting or reflecting
           light; "its luminosity is measured relative to that of our
           sun" [syn: luminosity, brightness, brightness level,
           luminance, luminousness, light]

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