The quality or state of being countable; the property that allows something to be counted or enumerated.
Formed from 'countable' plus the suffix '-ness' (a quality or state), creating a noun that emphasizes the condition of being able to be counted. This is a more emphatic version of 'countability'.
English speakers often prefer '-ity' endings for abstract qualities from adjectives (like 'ability' over 'ableness'), so 'countableness' sounds deliberately formal or archaic—it's the kind of word philosophers might use for precision!
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