Etymology
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greenness (n.)

Old English grennes "green color; quality of being green," in plural, "green things, plants;" see green (adj.) + -ness. Meaning "immaturity" is from early 15c. Walpole coined greenth (1753) in the same sense.

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Definitions of greenness

greenness (n.)
the lush appearance of flourishing vegetation;
Synonyms: verdancy / verdure
greenness (n.)
the state of not being ripe;
greenness (n.)
green color or pigment; resembling the color of growing grass;
Synonyms: green / viridity
From wordnet.princeton.edu