The quality or state of being grassy; the presence or abundance of grass in a place.
Formed from 'grassy' (grass + '-y') plus the abstract noun suffix '-ness' (Old English 'nis'). A standard English formation dating back centuries for creating abstract nouns.
The '-ness' suffix is so productive in English that you can theoretically add it to almost any adjective to create a noun—this flexibility has allowed English speakers to name abstract concepts for over a thousand years.
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