noun
all citizens; the whole city
Refers to every citizen of a city, or the entire population collectively. Can also mean 'the whole city' as a metonym for its inhabitants.
全市民に避難勧告が出された。
An evacuation advisory was issued to all citizens.
そのニュースは全市民を驚かせた。
The news surprised the whole city.
Refers to all residents, including non-citizens; broader than 全市民.
Compound of 全 (zen, 'all') + 市民 (shimin, 'citizen'). A straightforward Sino-Japanese word.