Etymology
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blackness (n.)

late 14c., from black (adj.) + -ness.

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Definitions of blackness

blackness (n.)
the quality or state of the achromatic color of least lightness (bearing the least resemblance to white);
Synonyms: black / inkiness
blackness (n.)
total absence of light;
Synonyms: total darkness / lightlessness / pitch blackness / black
From wordnet.princeton.edu