The quality or state of being chatty; the tendency to talk a lot; an inclination toward conversation and gossip.
From chatty (inclined to chat) + -ness (noun-forming suffix creating abstract nouns). The suffix -ness transforms adjectives into nouns describing their qualities or states.
The -ness suffix is one of English's oldest and most productive tools for creating abstract nouns—chattiness, happiness, sadness—and it's been used for over a thousand years to turn descriptions into things we can talk about!
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