The quality or state of being common, ordinary, or frequently encountered; the degree to which something is widespread or shared.
From 'common' (Latin communis) + -ness (a suffix creating nouns from adjectives). This straightforward formation has existed since the 14th century to describe the property of being common.
The 'commonness' of something is actually proof of how successful it became—a lightbulb's commonness means Edison's invention truly changed the world, while a rare disease's rarity means fewer people had to suffer it.
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