Civility
Etymology
From Latin civilitas "the art of governing, citizenship," from civis "citizen." Civility originally meant good citizenship — conducting oneself as a proper member of the polity. The tie to citizenship is the point: it is the conduct that makes co-existence possible among people who need not be friends.
noun · /suh-VIL-uh-tee/
Basic respectful conduct toward others, especially across disagreement or difference.
What it names
A handle for the minimum courtesy that keeps shared life functioning — the floor of respect owed to fellow citizens, not a sign of liking or agreement.
Example
They disagreed on nearly everything, but treated each other with a civility their followers online never showed.
Related idea
Distinct from courtesy: courtesy is warm and personal, a positive gesture toward someone; civility is cooler and civic, the restraint that lets adversaries share a society. Critics note that "civility" can be weaponized to police the tone of the aggrieved — the word carries political weight courtesy does not.