The quality or state of being durable; the ability to last a long time without breaking or wearing out.
From 'durable' plus the suffix '-ness,' which creates abstract nouns from adjectives. 'Durable' itself comes from Latin 'durus' (hard).
Old English loved creating abstract noun forms with '-ness'—we still do this today (happy→happiness), which lets us turn physical properties into philosophical concepts!
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