9 letters · 17 points in Scrabble
noun the quality or state of the achromatic color of least lightness (bearing the least resemblance to white)
noun total absence of light
originInherited from Middle English blaknesse, equivalent to black + -ness. Sense 5 most likely both originated from the masque The Masque of Blackness by Ben Jonson and later changed to its current positive sense.
Etymology from Wiktionary, CC BY-SA 3.0