The realm or domain of citizens; the state of being a citizen collectively, or the world of citizens and citizenship.
From 'citizen' plus '-dom' (Old English, meaning 'kingdom' or 'domain'); modeled on words like 'kingdom' and 'Christendom' to indicate a sphere or collective state.
The '-dom' suffix connects this word to ancient Germanic kingdoms—when you say 'citizendom' you're invoking the same linguistic structure used for medieval 'Christendom' and 'heathendom.'
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