Noun blackness has 2 senses
  1. black, blackness - the quality or state of the achromatic color of least lightness (bearing the least resemblance to white)
    --1 is a kind of achromatic color, achromatic colour
    --1 has particulars:
     coal black, ebony, jet black, pitch black, sable, soot black
  2. total darkness, lightlessness, blackness, pitch blackness, black - total absence of light; "they fumbled around in total darkness"; "in the black of night"
    --2 is a kind of dark, darkness
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