say it: GREEN-nuhs
greenness is a noun meaning "the lush appearance of flourishing vegetation". It carries 3 recorded senses.
the state of not being ripe
green color or pigment; resembling the color of growing grass
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for greenness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.