The quality or state of being greasy; oiliness or the amount of grease present in something.
From 'greasy' + '-ness' (abstract noun suffix); this nominalization turns an adjective describing a physical property into an abstract noun that discusses the condition itself.
The '-ness' suffix is how English transforms adjectives into nouns—any quality can become countable this way (happiness, sadness, greasiness, laziness). In the 1500s, this suffix exploded in productivity, and English speakers used it to create thousands of new nouns in just a few generations.
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