The realm, domain, or collective world of cities and urban areas; the state of being a city or belonging to city life.
Compound of city and the suffix -dom (Old English dom, from Germanic roots meaning 'domain,' 'judgment,' 'condition'). Similar to kingdom, dukedom, and Christendom, it treats 'city' as a dominion or sphere.
The suffix '-dom' originally meant 'judgment' in Old English, so citydom literally means 'the judgment/rule of cities'—it's a poetic way of saying cities have their own laws and ways, distinct from countryside rule.
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