The quality or state of being curved.
From 'curved' + '-ness' (noun-forming suffix creating abstract nouns). The '-ness' suffix is one of the oldest in English, used to create nouns from adjectives.
While 'curvature' is the technical term, 'curvedness' emphasizes the observable quality—it's the difference between measuring a circle's exact curve versus just noticing 'wow, that's really curved!'
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