The quality or state of being civil; courtesy, politeness, and respectful behavior in social interactions.
From the adjective 'civil' (Latin 'civilis,' relating to citizens) plus the suffix '-ness' to form an abstract noun indicating a quality or state.
While 'civility' is the more common word today, 'civilness' shows that English speakers have long tried different ways to name the quality of being polite—and both lead us back to the Latin idea of proper citizen behavior.
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